Detections
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SCA: security update for authlib (GHSA-c5mf-xmp2-59rc)

medium Tenable Cloud Security Plugin ID 477595

Description

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,
 OpenIDMixin.parse_id_token() reads the nonce_supported decision from the untrusted ID token being
 validated and sets the expected nonce to null when that claim is the JSON boolean false. In implicit and
 hybrid relying parties, or applications that directly accept externally supplied ID tokens, an attacker
 with a captured validly signed token can bypass the nonce-to-session binding and replay the victim's token
 into an attacker-controlled session. Plain authorization code flow is not affected, and the token must
 still pass signature, issuer, and audience validation. OpenIDMixin.parse_id_token() trusts nonce_supported
 in both authlib/integrations/base_client/sync_openid.py and
 authlib/integrations/base_client/async_openid.py to disable the expected nonce. This issue is fixed in
 version 1.9.0. (CVE-2026-114617)

Solution

Update the authlib library and its related packages to version 1.9.0 or later.

See Also

https://github.com/advisories/GHSA-c5mf-xmp2-59rc

Plugin Details

Severity: Medium

ID: 477595

Version: Revision 1.2

Type: Local

Family: SCA Checks

Published: 10/27/2026

Updated: 11/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 2.1

Percentile: 8.3

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3.1

Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2026-114617

CVSS v3

Risk Factor: Medium

Base Score: 4.2

Temporal Score: 3.8

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/27/2026

Vulnerability Publication Date: 10/22/2026

Reference Information

CVE: CVE-2026-114617