Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, Authlib's RFC 9101 JWTAuthenticationRequest passes the unauthenticated, client-controlled request_uri parameter to the abstract get_request_object() hook before applying a destination or registration policy; the hook itself performs no network request, while the documentation demonstrates an unrestricted HTTP fetch. In deployments whose integrator implements that hook as an unrestricted outbound fetch, a remote attacker who knows a valid public client identifier can make the authorization server request internal, link-local, or otherwise unintended URLs and can distinguish fetch outcomes through different error responses and timing. Deployments whose custom hook already applies a secure allowlist, destination controls, and retrieval limits are not affected. The JWTAuthenticationRequest implementation in authlib/oauth2/rfc9101/authorization_server.py forwards request_uri to get_request_object() before an application-approved retrieval policy accepts the destination. This issue is fixed in version 1.9.0.

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

  - Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, Authlib's RFC
    9101 JWTAuthenticationRequest passes the unauthenticated, client-controlled request_uri parameter to the
    abstract get_request_object() hook before applying a destination or registration policy; the hook itself
    performs no network request, while the documentation demonstrates an unrestricted HTTP fetch. In
    deployments whose integrator implements that hook as an unrestricted outbound fetch, a remote attacker who
    knows a valid public client identifier can make the authorization server request internal, link-local, or
    otherwise unintended URLs and can distinguish fetch outcomes through different error responses and timing.
    Deployments whose custom hook already applies a secure allowlist, destination controls, and retrieval
    limits are not affected. The JWTAuthenticationRequest implementation in
    authlib/oauth2/rfc9101/authorization_server.py forwards request_uri to get_request_object() before an
    application-approved retrieval policy accepts the destination. This issue is fixed in version 1.9.0.
    (CVE-2026-114620)

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

  - Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, Authlib's RFC     9101 JWTAuthenticationRequest passes the unauthenticated, client-controlled request_uri parameter to the     abstract get_request_object() hook before applying a destination or registration policy; the hook itself     performs no network request, while the documentation demonstrates an unrestricted HTTP fetch. In     deployments whose integrator implements that hook as an unrestricted outbound fetch, a remote attacker who     knows a valid public client identifier can make the authorization server request internal, link-local, or     otherwise unintended URLs and can distinguish fetch outcomes through different error responses and timing.
    Deployments whose custom hook already applies a secure allowlist, destination controls, and retrieval     limits are not affected. The JWTAuthenticationRequest implementation in     authlib/oauth2/rfc9101/authorization_server.py forwards request_uri to get_request_object() before an     application-approved retrieval policy accepts the destination. This issue is fixed in version 1.9.0.
    (CVE-2026-114620)

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

ID	Name	Product	Family	Type	Severity
477590	SCA: security update for authlib (GHSA-x4rv-c3wx-4cr8)	Tenable Cloud Security	SCA Checks	Local	medium
477590	SCA: security update for authlib (GHSA-x4rv-c3wx-4cr8)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium
371339	Linux Distros Unpatched Vulnerability : CVE-2026-114620	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-114620

medium

Tenable Plugins

medium

medium

medium