CVE-2026-48526
Last modified
CVE-2026-48526 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. 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. EPSS estimates a 0.23% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Pyjwt Project | Pyjwt | < 2.13.0 |
References
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-xgmm-8j9v-c9wxExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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