[pkg-vuln] CVE-2026-102268 in pyjwt@2.13.0 #892

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kert · 2026-09-30T06:01:57Z

kert commented

2026-09-30 06:01:57 +00:00

Severity: CRITICAL
Package: pyjwt @ 2.13.0
Fixed in: 2.14.0

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, is_pem_format in jwt/utils.py is affected because is_pem_format does not recognize every PEM representation accepted by the cryptography loader. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a mutated public-key PEM as raw key bytes. As a result, HMACAlgorithm.prepare_key treats the unrecognized asymmetric public key as an HMAC secret. Consequently, an attacker who knows the public

Reference: https://nvd.nist.gov/vuln/detail/CVE-2026-102268

**Severity:** CRITICAL **Package:** `pyjwt` @ `2.13.0` **Fixed in:** `2.14.0` PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, is_pem_format in jwt/utils.py is affected because is_pem_format does not recognize every PEM representation accepted by the cryptography loader. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a mutated public-key PEM as raw key bytes. As a result, HMACAlgorithm.prepare_key treats the unrecognized asymmetric public key as an HMAC secret. Consequently, an attacker who knows the public **Reference:** https://nvd.nist.gov/vuln/detail/CVE-2026-102268

kert added this to the P21: Package Supply Chain — inventory, mirrors, drift, vuln scanning milestone 2026-09-30 06:01:57 +00:00

kert added the quality ci labels 2026-09-30 06:01:57 +00:00

kert closed this issue

2026-10-27 16:15:16 +00:00

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Reference: homelab/stack#892