CVE-2026-96760

Authlib library contains a signature‑verification bypass vulnerability

At a glance

Severity: CRITICAL 9.8
EPSS: EPSS 0.38 % · percentile 32 (2026-10-27)
State: PUBLISHED
Published: 2026-09-28
Updated: 2026-10-01
Assigner: certcc
NVD status: Awaiting Analysis

Description

Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and without requiring a cryptographic key.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Weaknesses (CWE)

Advisories

GHSA-6v38-4h7w-rj9h — Authlib: empty signatures validation in JWS JSON deserialization

European references

ENISA EUVD · EUVD-2026-88465
GCVE · GCVE-0-2026-96760

Affected products

Product	Versions
Authlib · Authlib	affected 1.7.2

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD