CVE-2026-114615: authlib · Incomplete List of Disallowed Inputs
Affects authlibSource CVE Database V5
Mentioned vulnerabilities
Not known to be exploited · CVSS 7.4 High : upgrade to 1.9.0 soon.
Data as of 26 Oct 2026, 14:18 UTC
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 1.9.0
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 22 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade authlib to 1.9.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| authlibauthlib | Affected
| Fixed in
|
Description
Authlib is a Python library which builds OAuth and OpenID Connect servers. From 1.3.1 until 1.9.0, OctKey.import_key() checks asymmetric-key markers only at byte zero while Authlib's PEM loaders accept leading whitespace, comments, or a byte-order mark. In deployments that use the documented mixed algorithm registry and already configure verification with PEM or certificate bytes containing such a prefix, an unauthenticated attacker who knows those same public-key bytes can use them as an HMAC secret and forge HS256 tokens with arbitrary identity or authorization claims. This is a bypass of the remediation for CVE-2024-37568. The module-level jwt object reaches OctKey.import_key() in authlib/jose/rfc7518/oct_key.py, where POSSIBLE_UNSAFE_KEYS fails to identify prefixed asymmetric key material. This issue is fixed in version 1.9.0.
References
- github.com/authlib/authlib/security/advisories/GHSA-7vr2-2fgp-9w7p (opens in a new tab)
- github.com/authlib/authlib/pull/945 (opens in a new tab)
- github.com/authlib/authlib/commit/e3bd41cb29dcfee434453b135ffb487884baeedf (opens in a new tab)
- github.com/authlib/authlib/releases/tag/v1.9.0 (opens in a new tab)