PyJWT is a JSON Web Token implementation in Python. Prior to 2.12.0, PyJWT does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC. This vulnerability is fixed in 2.12.0.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:17083 advisory.

    The fence-agents packages provide a collection of scripts for handling remote power management for cluster     devices. They allow failed or unreachable nodes to be forcibly restarted and removed from the cluster.

    Security Fix(es):

    * pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 ?4.1.11 MUST violation) (CVE-2026-32597)

    * pyasn1: pyasn1 Vulnerable to Denial of Service via Unbounded Recursion (CVE-2026-30922)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 12 / 13 host has packages installed that are affected by a vulnerability as referenced in the dsa-6259 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6259-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     May 09, 2026                          https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : pyjwt     CVE ID         : CVE-2026-32597

    It was discovered that PyJWT, a Python implementation of JSON web tokens     insufficiently validated the crit header parameter, which could result     in incomplete enforcement of authentication settings.

    For the oldstable distribution (bookworm), this problem has been fixed     in version 2.6.0-1+deb12u1.

    For the stable distribution (trixie), this problem has been fixed in     version 2.10.1-2+deb13u1.

    We recommend that you upgrade your pyjwt packages.

    For the detailed security status of pyjwt please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/pyjwt

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:13916 advisory.

    * pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 ?4.1.11 MUST violation) (CVE-2026-32597)

    * pyasn1: pyasn1 Vulnerable to Denial of Service via Unbounded Recursion (CVE-2026-30922)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:13916 advisory.

    * pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 ?4.1.11 MUST violation) (CVE-2026-32597)
      * pyasn1: pyasn1 Vulnerable to Denial of Service via Unbounded Recursion (CVE-2026-30922)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-13916 advisory.

    - bundled pyasn1: replace with dependency to fix CVE-2026-30922

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:13916 advisory.

    The fence-agents packages provide a collection of scripts for handling remote power management for cluster     devices. They allow failed or unreachable nodes to be forcibly restarted and removed from the cluster.

    Security Fix(es):

    * pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 ?4.1.11 MUST violation) (CVE-2026-32597)

    * pyasn1: pyasn1 Vulnerable to Denial of Service via Unbounded Recursion (CVE-2026-30922)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:13672 advisory.

    * cryptography: cryptography Subgroup Attack Due to Missing Subgroup Validation for SECT Curves     (CVE-2026-26007)

    * pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 ?4.1.11 MUST violation) (CVE-2026-32597)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has a package installed that is affected by a vulnerability as referenced in the dla-4564 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4564-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                   Jochen Sprickerhof     May 05, 2026                                  https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : pyjwt     Version        : 1.7.1-2+deb11u1     CVE ID         : CVE-2026-32597

    It was discovered that PyJWT, a Python implementation of JSON Web Token     did not validate the crit (Critical) Header Parameter defined in RFC 7515     4.1.11. When a JWS token contains a crit array listing extensions that PyJWT     does not understand, the library accepts the token instead of rejecting it.
    This violates the MUST requirement in the RFC.

    For Debian 11 bullseye, this problem has been fixed in version     1.7.1-2+deb11u1.

    We recommend that you upgrade your pyjwt packages.

    For the detailed security status of pyjwt please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/pyjwt

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:13672 advisory.

    The fence-agents packages provide a collection of scripts for handling remote power management for cluster     devices. They allow failed or unreachable nodes to be forcibly restarted and removed from the cluster.

    Security Fix(es):

    * cryptography: cryptography Subgroup Attack Due to Missing Subgroup Validation for SECT Curves     (CVE-2026-26007)

    * pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 ?4.1.11 MUST violation) (CVE-2026-32597)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 / 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:13512 advisory.

    Red Hat Ansible Automation Platform provides an enterprise framework for building, deploying and managing     IT automation at scale. IT Managers can provide top-down guidelines on how automation is applied to     individual teams, while automation developers retain the freedom to write tasks that leverage existing     knowledge without the overhead. Ansible Automation Platform makes it possible for users across an     organization to share, vet, and manage automation content by means of a simple, powerful, and agentless     language.

    Security Fix(es):
    * automation-controller: Account hijacking and unauthorized access via unverified email linking     (CVE-2026-6266)
    * automation-controller: PyJWT accepts unknown `crit` header extensions (RFC 7515 4.1.11 MUST violation)     (CVE-2026-32597)
    * automation-controller: denial of service via malformed HTML-like sequences (CVE-2025-69534)
    * automation-controller: cryptography Subgroup Attack Due to Missing Subgroup Validation for SECT Curves     (CVE-2026-26007)
    * automation-gateway: Account hijacking and unauthorized access via unverified email linking     (CVE-2026-6266)
    * automation-gateway: Rollup: Remote Code Execution via Path Traversal Vulnerability (CVE-2026-27606)
    * automation-gateway: SVGO: Denial of Service via XML entity expansion (CVE-2026-29074)
    * automation-gateway: ReDoS via $data reference (CVE-2025-69873)
    * automation-gateway-proxy: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679)
    * python3.12-django-ansible-base: Account hijacking and unauthorized access via unverified email linking     (CVE-2026-6266)
    * python3.12-markdown: denial of service via malformed HTML-like sequences (CVE-2025-69534)
    * python3.12-jwcrypto: JWCrypto: Memory exhaustion via crafted compressed JWE tokens (CVE-2026-39373)
    * python3.12-pyasn1: pyasn1 Vulnerable to Denial of Service via Unbounded Recursion (CVE-2026-30922)
    * python3.12-pyasn1: pyasn1: Denial of Service due to memory exhaustion from malformed RELATIVE-OID     (CVE-2026-23490)
    * python3.12-pyOpenSSL: DTLS cookie callback buffer overflow (CVE-2026-27459)
    * receptor: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    For details about this release, refer to the release notes listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 / 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:13508 advisory.

    Red Hat Ansible Automation Platform provides an enterprise framework for building, deploying and managing     IT automation at scale. IT Managers can provide top-down guidelines on how automation is applied to     individual teams, while automation developers retain the freedom to write tasks that leverage existing     knowledge without the overhead. Ansible Automation Platform makes it possible for users across an     organization to share, vet, and manage automation content by means of a simple, powerful, and agentless     language.

    Security Fix(es):
    * automation-controller: Account hijacking and unauthorized access via unverified email linking     (CVE-2026-6266)
    * automation-controller: DTLS cookie callback buffer overflow (CVE-2026-27459)
    * automation-controller: PyJWT accepts unknown `crit` header extensions (RFC 7515 4.1.11 MUST violation)     (CVE-2026-32597)
    * automation-controller: denial of service via malformed HTML-like sequences (CVE-2025-69534)
    * automation-gateway: Account hijacking and unauthorized access via unverified email linking     (CVE-2026-6266)
    * automation-gateway-proxy: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679)
    * automation-platform-ui: Rollup: Remote Code Execution via Path Traversal Vulnerability (CVE-2026-27606)
    * automation-platform-ui: minimatch: Denial of Service via specially crafted glob patterns     (CVE-2026-26996)
    * python3.12-django-ansible-base: Account hijacking and unauthorized access via unverified email linking     (CVE-2026-6266)
    * python3.12-markdown: denial of service via malformed HTML-like sequences (CVE-2025-69534)
    * python3.12-jwcrypto: JWCrypto: Memory exhaustion via crafted compressed JWE tokens (CVE-2026-39373)
    * python3.12-pyasn1: pyasn1 Vulnerable to Denial of Service via Unbounded Recursion (CVE-2026-30922)
    * python3.12-pyasn1: pyasn1: Denial of Service due to memory exhaustion from malformed RELATIVE-OID     (CVE-2026-23490)
    * python3.12-pyOpenSSL: DTLS cookie callback buffer overflow (CVE-2026-27459)
    * receptor: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    For details about this release, refer to the release notes listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-538:07 advisory.

    * cryptography: cryptography Subgroup Attack Due to Missing Subgroup Validation for SECT Curves     (CVE-2026-26007)
      * pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 ?4.1.11 MUST violation)     (CVE-2026-32597)
      * pyasn1: pyasn1 Vulnerable to Denial of Service via Unbounded Recursion (CVE-2026-30922)

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:12176 advisory.

    The fence-agents packages provide a collection of scripts for handling remote power management for cluster     devices. They allow failed or unreachable nodes to be forcibly restarted and removed from the cluster.

    Security Fix(es):

    * cryptography: cryptography Subgroup Attack Due to Missing Subgroup Validation for SECT Curves     (CVE-2026-26007)

    * pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 ?4.1.11 MUST violation) (CVE-2026-32597)

    * pyasn1: pyasn1 Vulnerable to Denial of Service via Unbounded Recursion (CVE-2026-30922)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-12176 advisory.

    - bundled cryptography: replace with dependency to fix CVE-2026-26007
    - bundled PyJWT: replace with dependency to fix CVE-2026-32597

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:12176 advisory.

    * cryptography: cryptography Subgroup Attack Due to Missing Subgroup Validation for SECT Curves     (CVE-2026-26007)
      * pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 ?4.1.11 MUST violation)     (CVE-2026-32597)
      * pyasn1: pyasn1 Vulnerable to Denial of Service via Unbounded Recursion (CVE-2026-30922)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:12176 advisory.

    * cryptography: cryptography Subgroup Attack Due to Missing Subgroup Validation for SECT Curves     (CVE-2026-26007)

    * pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 ?4.1.11 MUST violation) (CVE-2026-32597)

    * pyasn1: pyasn1 Vulnerable to Denial of Service via Unbounded Recursion (CVE-2026-30922)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:1389-1 advisory.

    - CVE-2026-32597: Fixed unknown `crit` header extensions accepts (bsc#1259616).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:1400-1 advisory.

    - CVE-2026-32597: Fixed unknown `crit` header extensions accepts (bsc#1259616).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

An update of the python3 package has been released.

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:1199-1 advisory.

    - CVE-2026-32597: Fixed unknown `crit` header extensions accepts (bsc#1259616).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1519 advisory.

    A missing verification step has been discovered in PyJWT. PyJWT does not validate the crit (Critical)     Header Parameter defined in RFC 7515 SS4.1.11. When a JWS token contains a crit array listing extensions     that PyJWT does not understand, the library accepts the token instead of rejecting it. This violates the     MUST requirement in the RFC. (CVE-2026-32597)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by a vulnerability as referenced in the USN-8133-1 advisory.

    It was discovered that PyJWT did not validate the critical header parameter, contrary to the RFC     specification expectations. A remote attacker could possibly use this issue to bypass certain     authentication checks and restrictions.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
314496	RHEL 10 : fence-agents (RHSA-2026:17083)	Nessus	Red Hat Local Security Checks	high
313512	Debian dsa-6259 : python-jwt-doc - security update	Nessus	Debian Local Security Checks	high
313037	RockyLinux 10 : fence-agents (RLSA-2026:13916)	Nessus	Rocky Linux Local Security Checks	high
312683	AlmaLinux 10 : fence-agents (ALSA-2026:13916)	Nessus	Alma Linux Local Security Checks	high
312671	Oracle Linux 10 : fence-agents (ELSA-2026-13916)	Nessus	Oracle Linux Local Security Checks	high
312389	RHEL 10 : fence-agents (RHSA-2026:13916)	Nessus	Red Hat Local Security Checks	high
312328	RockyLinux 9 : fence-agents (RLSA-2026:13672)	Nessus	Rocky Linux Local Security Checks	high
312261	Debian dla-4564 : python3-jwt - security update	Nessus	Debian Local Security Checks	high
312175	RHEL 9 : fence-agents (RHSA-2026:13672)	Nessus	Red Hat Local Security Checks	high
312098	RHEL 8 / 9 : Red Hat Ansible Automation Platform 2.5 Product Security and Bug Fix Update (Important) (RHSA-2026:13512)	Nessus	Red Hat Local Security Checks	critical
312090	RHEL 10 / 9 : Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update (Important) (RHSA-2026:13508)	Nessus	Red Hat Local Security Checks	critical
311946	MiracleLinux 8 : fence-agents-4.2.1-129.el8_10.25 (AXSA:2026-538:07)	Nessus	Miracle Linux Local Security Checks	high
311515	RHEL 8 : fence-agents (RHSA-2026:12176)	Nessus	Red Hat Local Security Checks	high
311355	Oracle Linux 8 : fence-agents (ELSA-2026-12176)	Nessus	Oracle Linux Local Security Checks	high
311296	AlmaLinux 8 : fence-agents (ALSA-2026:12176)	Nessus	Alma Linux Local Security Checks	high
311281	RockyLinux 8 : fence-agents (RLSA-2026:12176)	Nessus	Rocky Linux Local Security Checks	high
306878	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : python-PyJWT (SUSE-SU-2026:1389-1)	Nessus	SuSE Local Security Checks	high
306870	SUSE SLED15 / SLES15 Security Update : python-PyJWT (SUSE-SU-2026:1400-1)	Nessus	SuSE Local Security Checks	high
305997	Photon OS 5.0: Python3 PHSA-2026-5.0-0816	Nessus	PhotonOS Local Security Checks	high
305992	Photon OS 4.0: Python3 PHSA-2026-4.0-0995	Nessus	PhotonOS Local Security Checks	high
305284	SUSE SLES12 Security Update : python-PyJWT (SUSE-SU-2026:1199-1)	Nessus	SuSE Local Security Checks	high
304621	Amazon Linux 2023 : python3-jwt, python3-jwt+crypto (ALAS2023-2026-1519)	Nessus	Amazon Linux Local Security Checks	high
304434	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 : PyJWT vulnerability (USN-8133-1)	Nessus	Ubuntu Local Security Checks	high

Detections

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CVE-2026-32597

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