{"id":"CVE-2026-101917","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-101917","generatedAt":"2026-10-27T22:47:13.972Z","title":"Consequently, attacker traffic can amplify outbound requests to the configured JWKS endpoint.","description":"PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT get_signing_key_from_jwt is affected because unknown kid misses force refreshes without a negative cache or minimum refresh interval. This occurs when unauthenticated tokens repeatedly use the same unknown kid or varying kid values absent from the cached JWKS. As a result, each cache miss causes PyJWKClient to refresh the JWKS. Consequently, attacker traffic can amplify outbound requests to the configured JWKS endpoint. This issue is fixed in version 2.14.0.","published":"2026-09-28T21:17:13.000Z","lastModified":"2026-10-07T21:01:01.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-770"],"affected":["pyjwt project/pyjwt"],"epss":{"score":0.00428,"percentile":0.3676,"date":"2026-10-26","history":[{"date":"2026-09-29","score":0.00354,"percentile":0.26573}]},"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 (0.43%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"scored","label":"Newly scored","at":"2026-10-07T22:30:11.000Z","detail":{"from":"5.3","score":"7.5","severity":"HIGH","fromSeverity":"MEDIUM"},"summary":"Now scored CVSS 7.5 HIGH (was 5.3)."},{"kind":"new","label":"New CVE","at":"2026-09-28T21:17:13.000Z","detail":{"score":"5.3","severity":"MEDIUM","publishedAt":"2026-09-28T21:17:13.210Z"},"summary":"New CVE, high severity (CVSS 7.5)."}],"references":[{"url":"https://github.com/jpadilla/pyjwt/commit/ba4853a75fb9676362da17f67d0f64bd18afd4e1","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/jpadilla/pyjwt/releases/tag/2.14.0","tags":["Product","Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-2gx3-rcp4-g85q","tags":["Exploit","Vendor Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-2gx3-rcp4-g85q","tags":["Exploit","Vendor Advisory"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-101917","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."}