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CVE-2026-114618

CVE-2026-114618 · Authlib: Default JWT bearer grant accepts assertions for the wrong audience

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

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, the default RFC 7523 JWTBearerGrant.get_audiences() returns an empty list, causing JWTBearerGrant.verify_claims() to require only that an aud claim exists without matching the current authorization server. An attacker holding a legitimate assertion for another service can present it to a server that shares the signing key and uses the default grant, obtaining an access token across a trust boundary. Implementations that override get_audiences() with the server's valid audience identifiers are not affected. This issue is fixed in version 1.9.0.

CVSS 6.8 · Medium · EPSS 0.2%

Published
Updated

Stack: system

Affected products and versions

  • authlib

    Versions
    • < 1.9.0: Affected

    No fix published

  • python-authlib Debian:12

    Versions
    • 1.2.0-1
    • 1.2.0-1+deb12u1
    • 1.2.0-1+deb12u2
    • 1.2.1-1
    • 1.3.0-1
    • 1.3.0-2
    • 1.3.0-3
    • 1.3.1-1
    • 1.3.2-1
    • 1.3.2-2
    • 1.4.0-1
    • 1.4.1-1
    • 1.5.0-1
    • 1.5.1-1
    • 1.5.2-1
    • 1.6.0-1
    • 1.6.1-1
    • 1.6.3-1
    • 1.6.4-1
    • 1.6.5-1
    • 1.6.6-1
    • 1.6.7-1
    • 1.6.8-1
    • 1.6.9-1
    • 1.7.0-1
    • 1.7.2-1
    • 1.7.2-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-authlib Debian:13

    Versions
    • 1.6.0-1
    • 1.6.0-1+deb13u1
    • 1.6.1-1
    • 1.6.3-1
    • 1.6.4-1
    • 1.6.5-1
    • 1.6.6-1
    • 1.6.7-1
    • 1.6.8-1
    • 1.6.9-1
    • 1.7.0-1
    • 1.7.2-1
    • 1.7.2-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-authlib Debian:14

    Versions
    • 1.6.0-1
    • 1.6.1-1
    • 1.6.3-1
    • 1.6.4-1
    • 1.6.5-1
    • 1.6.6-1
    • 1.6.7-1
    • 1.6.8-1
    • 1.6.9-1
    • 1.7.0-1
    • 1.7.2-1
    • 1.7.2-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-authlib Ubuntu:Pro:22.04:LTS

    Versions
    • 0.15.4-1
    • 0.15.5-1
    • 0.15.5-1ubuntu0.1~esm1
    • 0.15.5-1ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-authlib Ubuntu:Pro:24.04:LTS

    Versions
    • 1.2.1-1
    • 1.3.0-1
    • 1.3.0-1ubuntu0.1~esm1
    • 1.3.0-1ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-authlib Ubuntu:26.10

    Versions
    • 1.6.7-1
    • 1.7.2-1
    • 1.7.2-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-authlib Ubuntu:Pro:26.04:LTS

    Versions
    • 1.6.0-1
    • 1.6.5-1
    • 1.6.6-1
    • 1.6.7-1
    • 1.6.7-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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