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  4. CVE 2026 114616 authlib accepts an empty hmac key allowing jwsjwt
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Back to active CVEs
High · CVSS 7.4CVE-2026-114616

Authlib accepts an empty HMAC key, allowing JWS/JWT signature forgery (HS256/HS384/HS512)CVE-2026-114616

Answer in brief

CVE-2026-114616 records a High severity (CVSS 7.4) vulnerability in Authlib accepts an empty HMAC key, allowing JWS/JWT signature forgery (HS256/HS384/HS512). 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
High · CVSS 7.4
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.4. 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<1.9.11.9.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for authlib/authlib.
  2. 2Review the reported fix. Update authlib/authlib to 1.9.1 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
Upstream source description

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.1, Authlib's OctKey.import_key() and HMAC signing and verification path accept zero-length key material. If an application's secret lookup can return an empty string or empty bytes, a remote attacker can compute the deterministic HS256, HS384, or HS512 signature for arbitrary token claims and have Authlib treat the token as authentic. This issue is fixed in version 1.9.1.

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: ID token can disable its own nonce validation via the nonce_supported claimSame authlib/authlib package
  • Authlib: Default JWT bearer grant accepts assertions for the wrong audienceSame 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-326, CWE-1391
Source
CVE List V5
Source checked
Oct 22, 2026
References
3 linked sources
Open source record