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Security Advisories

CVE-2026-32597

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-32597

Severity

7.5

High

CVSS V3

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Summary

PyJWT accepts unknown crit header extensions (RFC 7515 §4.1.11 MUST violation)

Description

PyJWT is a JSON Web Token implementation in Python. Prior to 2.12.0, PyJWT does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC. This vulnerability is fixed in 2.12.0.

References

  • https://nvd.nist.gov/vuln/detail/CVE-2026-32597
  • https://github.com/advisories/GHSA-752w-5fwx-jx9f
  • https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32597.json
  • https://github.com/jpadilla/pyjwt/security/advisories/GHSA-752w-5fwx-jx9f

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