{"id":"CVE-2026-114616","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-114616","generatedAt":"2026-10-27T23:50:23.388Z","title":"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.","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.","published":"2026-10-22T22:18:04.000Z","lastModified":"2026-10-23T19:34:14.000Z","status":"Undergoing Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.4,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},"cwe":["CWE-287","CWE-326","CWE-1391"],"affected":[],"epss":{"score":0.00212,"percentile":0.11393,"date":"2026-10-26","history":[{"date":"2026-10-23","score":0.00212,"percentile":0.10916}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.21%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-22T22:18:04.000Z","detail":{"score":"7.4","severity":"HIGH","publishedAt":"2026-10-22T22:18:04.420Z"},"summary":"New CVE, high severity (CVSS 7.4)."}],"references":[{"url":"https://github.com/authlib/authlib/commit/4ff30db442c70e29486e1982cb0ad37c037f5f4b","source":"security-advisories@github.com"},{"url":"https://github.com/authlib/authlib/releases/tag/v1.9.1","source":"security-advisories@github.com"},{"url":"https://github.com/authlib/authlib/security/advisories/GHSA-8m4g-j4wp-wgcg","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-114616","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}