CVE-2026-114616
High · CVSS 7.4Published 2026-10-22
CVSS
7.4
High
EPSS
—
exploit probability
Active Exploit
No
not yet listed
What is CVE-2026-114616?
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.
CVSS Score Explained
CVSS 7.4 is High severity. Exploitation is likely straightforward and the impact is significant — data loss, privilege escalation, or remote code execution are common outcomes. Patch as soon as possible.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- ›https://github.com/authlib/authlib/commit/4ff30db442c70e29486e1982cb0ad37c037f5f4b
- PATCHhttps://github.com/authlib/authlib/releases/tag/v1.9.1
- ›https://github.com/authlib/authlib/security/advisories/GHSA-8m4g-j4wp-wgcg
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