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CVE-2026-102271

CVE-2026-102271 · PyJWT: Public keys in DER form are accepted as HMAC secrets, bypassing the CVE-2022-29217 guard

This page contains facts from public vulnerability sources. Check the original advisory before updating.

PyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.

CVSS 7.4 · High · EPSS 0.2% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • pyjwt

    Versions
    • >= 2.4.0, < 2.14.0: Affected

    No fix published

  • pyjwt Debian:12

    Versions
    • 2.10.1-1
    • 2.10.1-2
    • 2.10.1-3
    • 2.10.1-4
    • 2.11.0-2
    • 2.12.1-1
    • 2.13.0-1
    • 2.14.0-1
    • 2.15.0-1
    • 2.15.1-1
    • 2.6.0-1
    • 2.6.0-1+deb12u1
    • 2.7.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyjwt Debian:13

    Versions
    • 2.10.1-2
    • 2.10.1-2+deb13u1
    • 2.10.1-3
    • 2.10.1-4
    • 2.11.0-2
    • 2.12.1-1
    • 2.13.0-1
    • 2.14.0-1
    • 2.15.0-1
    • 2.15.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyjwt Debian:14

    Versions
    • 2.10.1-2
    • 2.10.1-3
    • 2.10.1-4
    • 2.11.0-2
    • 2.12.1-1
    • 2.13.0-1
    Affected ranges
    • ECOSYSTEM: < 2.14.0-1

    Update to 2.14.0-1

  • pyjwt PyPI

    Versions
    • 2.10.0
    • 2.10.1
    • 2.11.0
    • 2.12.0
    • 2.12.1
    • 2.13.0
    • 2.4.0
    • 2.5.0
    • 2.6.0
    • 2.7.0
    • 2.8.0
    • 2.9.0
    Affected ranges
    • ECOSYSTEM: ≥ 2.4.0, < 2.14.0

    Update to 2.14.0

  • pyjwt Ubuntu:Pro:16.04:LTS

    Versions
    • 1.0.0-0ubuntu1
    • 1.3.0-1
    • 1.3.0-1ubuntu0.1
    • 1.3.0-1ubuntu0.1+esm1
    • 1.3.0-1ubuntu0.1+esm2
    • 1.3.0-1ubuntu0.1+esm3
    • 1.3.0-1ubuntu0.1+esm4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyjwt Ubuntu:Pro:18.04:LTS

    Versions
    • 1.4.2-1.1
    • 1.5.3+ds1-1
    • 1.5.3+ds1-1ubuntu0.1
    • 1.5.3+ds1-1ubuntu0.1+esm1
    • 1.5.3+ds1-1ubuntu0.1+esm2
    • 1.5.3+ds1-1ubuntu0.1+esm3
    • 1.5.3+ds1-1ubuntu0.1+esm4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyjwt Ubuntu:Pro:20.04:LTS

    Versions
    • 1.7.0-2
    • 1.7.1-1
    • 1.7.1-2ubuntu1
    • 1.7.1-2ubuntu2
    • 1.7.1-2ubuntu2.1
    • 1.7.1-2ubuntu2.1+esm1
    • 1.7.1-2ubuntu2.1+esm2
    • 1.7.1-2ubuntu2.1+esm3
    • 1.7.1-2ubuntu2.1+esm4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyjwt Ubuntu:22.04:LTS

    Versions
    • 1.7.1-2ubuntu2
    • 2.1.0-1
    • 2.3.0-1
    • 2.3.0-1ubuntu0.1
    • 2.3.0-1ubuntu0.2
    • 2.3.0-1ubuntu0.3
    • 2.3.0-1ubuntu0.4
    • 2.3.0-1ubuntu0.5
    • 2.3.0-1ubuntu0.6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyjwt Ubuntu:24.04:LTS

    Versions
    • 2.7.0-1
    • 2.7.0-1ubuntu0.1
    • 2.7.0-1ubuntu0.2
    • 2.7.0-1ubuntu0.3
    • 2.7.0-1ubuntu0.4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyjwt Ubuntu:26.10

    Versions
    • 2.10.1-4ubuntu1
    • 2.12.1-1
    • 2.13.0-1
    • 2.13.0-1ubuntu1
    • 2.13.0-1ubuntu1.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyjwt Ubuntu:26.04:LTS

    Versions
    • 2.10.1-2
    • 2.10.1-3
    • 2.10.1-3build1
    • 2.10.1-4
    • 2.10.1-4ubuntu1
    • 2.10.1-4ubuntu1.1
    • 2.10.1-4ubuntu1.2
    • 2.10.1-4ubuntu1.3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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