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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History
Mon, 01 Jun 2026 18:00:00 +0000
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Pyjwt Project
Pyjwt Project pyjwt |
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| CPEs | cpe:2.3:a:pyjwt_project:pyjwt:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Pyjwt Project
Pyjwt Project pyjwt |
Fri, 29 May 2026 16:30:00 +0000
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ssvc
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Thu, 28 May 2026 17:00:00 +0000
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Jpadilla
Jpadilla pyjwt |
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Jpadilla
Jpadilla pyjwt |
Thu, 28 May 2026 15:30:00 +0000
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| Description | 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. | |
| Title | PyJWT: Public-key JWK accepted as HMAC secret enables forged HS256 tokens when mixed families are allowed | |
| Weaknesses | CWE-287 CWE-347 |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-05-29T15:15:55.958Z
Reserved: 2026-05-21T16:18:10.619Z
Link: CVE-2026-48526
Updated: 2026-05-29T15:15:53.152Z
Status : Analyzed
Published: 2026-05-28T16:16:29.657
Modified: 2026-06-01T17:45:32.253
Link: CVE-2026-48526
No data.
OpenCVE Enrichment
Updated: 2026-05-28T16:45:20Z