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CVE-2026-48526

PyJWT: Public-key JWK accepted as HMAC secret enables forged HS256 tokens when mixed families are allowed

CVSS 3.1 7.4 HIGHCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-48526

Published

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the secret key for HMAC algorithm. This vulnerability is fixed in 2.13.0.

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Affected versions, risk and source history

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CVE-2026-48526 · CVE overview and exploitation status

cve-program · CVE-2026-48526

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Sources read 15 Nov 06:00 UTC · 254 of 275 readable · 250 fully read · documentation 469/469 current

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