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CVE

CVE-2026-32597

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

CVE-2026-32597

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

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
C
H
U
-

Related Resources

No items found.

References

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

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.00013%
EPSS Percentile
0.02391%
Introduced Version
0
Fix Available
bd9700cca7f9258fadcc429c1034e508025931f2,0:4.10.0-98.el9_7.12,0:4.2.1-129.el8_10.25,2.6.0-1+deb12u1,1.7.1-2+deb11u1,2.10.1-2+deb13u1,0:2.7.0-1ubuntu0.1,0:1.5.3+ds1-1ubuntu0.1+esm1,0:1.7.1-2ubuntu2.1+esm1,0:2.3.0-1ubuntu0.3,0:2.4.0-1.amzn2023.0.3,2.11.2-r2,3.1.8-r8,2.11.2-r1,3.1.8-r1,2026.2.1-r4,2026.2.1-r3,24.6.1-r31,2.84.0-r3,0.51.0-r0,0.16.0-r22,1.23.0-r0,1.82.3.0-r0,2.5.0-r1,0.9.3-r3,0.8.10-r1,9.13-r1,0.27.0-r5,0.27.0-r6,1.156.0-r0,5.0.0-r20,6.0.0-r4,0.17.1-r1

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