Detections
Analytics

SCA: security update for authlib (GHSA-9ggr-2464-2j32)

high Tenable Cloud Security Plugin ID 435392

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 version 1.6.4,
 Authlib’s JWS verification accepts tokens that declare unknown critical header parameters (crit),
 violating RFC 7515 “must‑understand” semantics. An attacker can craft a signed token with a critical
 header (for example, bork or cnf) that strict verifiers reject but Authlib accepts. In mixed‑language
 fleets, this enables split‑brain verification and can lead to policy bypass, replay, or privilege
 escalation. This issue has been patched in version 1.6.4. (CVE-2025-59420)

See Also

https://github.com/advisories/GHSA-9ggr-2464-2j32

Plugin Details

Severity: High

ID: 435392

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 9/22/2025

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.73

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

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

CVSS Score Source: CVE-2025-59420

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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: 9/22/2025

Vulnerability Publication Date: 9/22/2025

Reference Information

CVE: CVE-2025-59420