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Back to active CVEs
Medium · CVSS 6.8CVE-2026-114618

Authlib: Default JWT bearer grant accepts assertions for the wrong audienceCVE-2026-114618

Answer in brief

CVE-2026-114618 records a Medium severity (CVSS 6.8) vulnerability in Authlib: Default JWT bearer grant accepts assertions for the wrong audience. The current sources do not mark it as known exploited. The current feed maps authlib/authlib (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 22, 2026Updated Oct 22, 2026Source checked Oct 22, 2026First seen by HOL Oct 22, 2026Material review Oct 22, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps authlib/authlib (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
authlib/authlibgeneric<1.9.01.9.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for authlib/authlib.
  2. 2Review the reported fix. Update authlib/authlib to 1.9.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 22, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Authlib: is_secure_transport() loopback exemption can be bypassed with a userinfo component, allowing cleartext-HTTP URLs to non-loopback hostsSame authlib/authlib package
  • Authlib incomplete algorithm-confusion fix permits HMAC forgery with prefixed public keysSame authlib/authlib package
  • Authlib accepts an empty HMAC key, allowing JWS/JWT signature forgery (HS256/HS384/HS512)Same authlib/authlib package
  • Authlib: ID token can disable its own nonce validation via the nonce_supported claimSame authlib/authlib package
  • Authlib: OpenID implicit grant checks raw scope instead of allowed scope before issuing ID tokensSame authlib/authlib package
  • Authlib: Unvalidated request_uri fetch in JWT-secured authorization request (JAR) leading to SSRFSame authlib/authlib package

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-287, CWE-1188
Source
CVE List V5
Source checked
Oct 22, 2026
References
4 linked sources
Open source record