PoC Index85,079 CVEs with PoCs

CVE-2026-102272

PyJWT BOM Bypass

HIGH 7.4EPSS 0.2%

PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.prepare_key in jwt/algorithms.py is affected because raw-JWK detector does not normalize accepted Unicode byte-order marks before checking for JSON. This occurs when a public JWK is prefixed with a UTF-8 BOM and used in a mixed-algorithm verification path. As a result, public JWK bypasses asymmetric-key detection and becomes the HMAC secret. Consequently, an attacker who knows the public key can forge authenticated tokens. This issue is fixed in version 2.14.0.

Affected
jpadilla · pyjwt
CVSS v3.1 GITHUB
7.4 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS
0.18% chance of exploitation in the next 30 days, 7th percentile
Published
2026-09-28
Updated
2026-09-29

Proof-of-concept exploits (1)

Security advisories

References