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CVE-2025-59420

Published: Sep 22, 2025Updated: Nov 3, 2025 Sources: CVE List NVD GHSACWE-345
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.2%
Top 84.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Authlib: JWS/JWT accepts unknown crit headers (RFC violation → possible authz bypass)

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-345CWE-863

Affected Products

authlibPyPIOSS Libraries
authlibauthlib
Library
OSS Libraries / generic-library
pypipackage-ecosystemOSS Libraries
authliboss-projectOSS Librariesaka jose rfc

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

3 techniques
Collection
Initial Access
View detailed technique mapping

References

https://github.com/authlib/authlib/security/advisories/GHSA-9ggr-2464-2j32
github.com
https://nvd.nist.gov/vuln/detail/CVE-2025-59420
nvd.nist.gov
https://github.com/authlib/authlib/commit/6b1813e4392eb7c168c276099ff7783b176479df
github.com
and 2 more references View all →

Timeline

Published
Sep 22, 2025
Last Updated
Nov 3, 2025

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