CVE-2026-102273 PyJWT - Authentication Bypass

PyJWT 2.13.0 to < 2.14.0 contains a broken authentication caused by improper HMAC key validation accepting public asymmetric key material as HMAC secret, letting attackers forge tokens with arbitrary claims, exploit requires use of public JWK container as raw key.

CVSS base score 7.4 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.18% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
28 September 2026
Updated
15 October 2026
Weakness
CWE-347

Vendor fix

Update to version 2.14.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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