{"id":"CVE-2026-55776","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-55776","generatedAt":"2026-10-28T00:18:45.321Z","title":"The Transit policy creation path in builtin/logical/transit/backend.go and sdk/helper/keysutil/policy.go could reach an error path that double-unlocked a mutex while handling this invalid asymmetric derived-key combination, causing a panic, no HTTP…","description":"OpenBao is an open source identity-based secrets management system. Prior to 2.5.5, an authenticated OpenBao caller with write access to transit/keys/* could terminate the server process by setting derived to true while the type parameter selected rsa-, ecdsa-, or ed25519. The Transit policy creation path in builtin/logical/transit/backend.go and sdk/helper/keysutil/policy.go could reach an error path that double-unlocked a mutex while handling this invalid asymmetric derived-key combination, causing a panic, no HTTP response, process exit, and denial of service. JSON and HCL key-creation requests can express the triggering combination. This issue is fixed in version 2.5.5.","published":"2026-09-15T16:17:16.000Z","lastModified":"2026-09-29T19:06:32.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-617"],"affected":[],"epss":{"score":0.00612,"percentile":0.4902,"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":"low","text":"Lower severity and a low EPSS score (0.61%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/openbao/openbao/commit/bb17827f3e33779a10166f7d0e61b191c0facef9","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/commit/db57c62602b25da12951f3f0edb888e7c4da61e5","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/pull/3309","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/pull/3312","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/releases/tag/v2.5.5","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/releases/tag/v2.6.0","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/security/advisories/GHSA-8w8f-r2xv-4q4j","source":"security-advisories@github.com"},{"url":"https://github.com/openbao/openbao/security/advisories/GHSA-8w8f-r2xv-4q4j","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55776","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."}