{"id":"CVE-2025-4658","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-4658","generatedAt":"2026-10-28T02:56:18.972Z","title":"Versions of OpenPubkey library prior to 0.10.0 contained a vulnerability that would allow a specially crafted JWS to bypass signature verification.","description":"Versions of OpenPubkey library prior to 0.10.0  contained a vulnerability that would allow a specially crafted JWS to bypass signature verification. As OPKSSH depends on the OpenPubkey library for authentication, this vulnerability in OpenPubkey also applies to OPKSSH versions prior to 0.5.0 and would allow an attacker to bypass OPKSSH authentication.","published":"2025-05-13T17:16:05.000Z","lastModified":"2026-06-17T09:33:44.000Z","status":"Analyzed","sourceIdentifier":"cna@cloudflare.com","cvss":{"version":"4.0","score":9.3,"severity":"CRITICAL","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-305","CWE-347"],"affected":["openpubkey/openpubkey","openpubkey/opkssh"],"epss":{"score":0.0034,"percentile":0.27319,"date":"2026-10-26","history":[]},"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 (0.34%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/openpubkey/opkssh","tags":["Product"],"source":"cna@cloudflare.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-4658","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."}