PyJWT accepts public JWK containers as HMAC secrets
CVE-2026-102273 is fixed in 4 products on 1 platform, first by python3-jwt 2.10.1-4ubuntu1.2, released September 28, 2026. It is not reported as exploited. Patch Radar priority: High.
PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because HMAC key guard only recognizes top-level public JWK forms and misses container representations. This occurs when an application allows HMAC and asymmetric algorithms and passes a public JWK container as the raw key. As a result, public asymmetric key material is accepted as the HMAC secret. Consequently, an attacker who knows the public key can forge a token with arbitrary authenticated claims. This issue is fixed in version 2.14.0.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| pyjwt · Debian 14 | 2.14.0-1 | DEBIAN-CVE-2026-102273 | Oct 4, 2026 |
| python-jwt · Ubuntu 18.04.6 LTS (bionic) | 1.5.3+ds1-1ubuntu0.1+esm3 | python-jwt 1.5.3+ds1-1ubuntu0.1+esm3 | Oct 27, 2026 |
| python3-jwt · Ubuntu 18.04.6 LTS (bionic) | 1.5.3+ds1-1ubuntu0.1+esm3 | python3-jwt 1.5.3+ds1-1ubuntu0.1+esm3 | Oct 27, 2026 |
| python3-jwt · Ubuntu 20.04 LTS (focal) | 1.7.1-2ubuntu2.1+esm3 | python3-jwt 1.7.1-2ubuntu2.1+esm3 | Oct 27, 2026 |
| python3-jwt · Ubuntu 22.04.1 LTS (jammy) | 2.3.0-1ubuntu0.5 | python3-jwt 2.3.0-1ubuntu0.5 | Oct 27, 2026 |
| python3-jwt · Ubuntu 24.04.5 LTS (noble) | 2.7.0-1ubuntu0.3 | python3-jwt 2.7.0-1ubuntu0.3 | Oct 27, 2026 |
| python3-jwt · Ubuntu 26.04.1 LTS (resolute) | 2.10.1-4ubuntu1.2 | python3-jwt 2.10.1-4ubuntu1.2 | Sep 28, 2026 |
| python3-jwt · amzn 2023 | 2.4.0-1.amzn2023.0.6 | ALAS2023-2026-3298 | Nov 7, 2026 |
| python3-jwt+crypto · amzn 2023 | 2.4.0-1.amzn2023.0.6 | ALAS2023-2026-3298 | Nov 7, 2026 |
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