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 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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-32597)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
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
302069	Linux Distros Unpatched Vulnerability : CVE-2026-32597	Nessus	Misc.	high

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