What’s Vulnerable › Vulnerabilities

CVE-2026-96760: Authlib library contains a signature‑verification bypass vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-28 · updated 2026-10-01
• Weakness: CWE-20

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.

Affected products

• authlib: 1.7.2

In the news

• VU#762428: Authlib library contains a signature‑verification bypass vulnerability

References

• https://github.com/authlib/authlib
• https://kb.cert.org/vuls/id/762428
• https://www.kb.cert.org/vuls/id/762428

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