PyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:87004 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-gateway: authorization bypass via workload identity token forgery (CVE-2026-94416)
    * automation-platform-ui: proxy-addr vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet     (CVE-2026-90711)
    * automation-platform-ui: compression: Denial of Service via memory leak on premature response close     (CVE-2026-87776)
    * automation-platform-ui: fflate: Denial of Service via crafted ZIP archives (CVE-2026-45820)
    * python3.12-pulpcore: file:// scheme allowlist bypass in content upload file_url field enables arbitrary     file read and Pulp Container registry signing key theft (CVE-2026-90959)
    * python3.12-pyjwt: Verification key substitution via unvalidated JWKS redirects (CVE-2026-102267)
    * python3.12-pyjwt: Token forgery via improper Unicode byte-order mark handling (CVE-2026-102272)
    * python3.12-pyjwt: Authentication bypass via empty HMAC key acceptance (CVE-2026-102266)
    * python3.12-pyjwt: Authentication bypass via acceptance of DER public keys as HMAC secrets     (CVE-2026-102271)
    * python3.12-pyjwt: Token forgery via acceptance of public JWK containers as HMAC secrets     (CVE-2026-102273)

    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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - PyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT
    HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are
    absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and
    supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an
    HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This
    issue is fixed in version 2.14.0. (CVE-2026-102271)

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 Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT     HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are     absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and     supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an     HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This     issue is fixed in version 2.14.0. (CVE-2026-102271)

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

ID	Name	Product	Family	Type	Severity
370142	RHEL 9 : Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update (Important) (RHSA-2026:87004)	Nessus	Red Hat Local Security Checks	Local	high
459398	Echo: pyjwt: security update to 2.14.0	Tenable Cloud Security	Echo Local Security Checks	Local	high
459398	Echo: pyjwt: security update to 2.14.0	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
351376	Linux Distros Unpatched Vulnerability : CVE-2026-102271	Nessus	Misc.	Local	high

Detections

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CVE-2026-102271

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Tenable Plugins

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