CVE-2026-114616
Authlib is a Python library which builds OAuth and OpenID Connect servers
- Risk score
- 62/100
- CVSS
- 7.4 v3.1
- Exploit chance (30 days)
- 0.2%
- Published
- 22 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 H…
- Affected
- See advisory
- Fix
- Upgrade the product to 1.9.1 or later.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 7.4 high
- Remotely exploitable without logging in
- On your watchlist: python
References
Original 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.
Last activity 22 Oct 2026. Patch Forecast updates every hour.