{"id":"CVE-2025-71426","aliases":["GHSA-vqv5-385r-2hf8","GO-2025-3455"],"url":"https://o3.security/vulnerability/CVE-2025-71426","summary":"Contrast before 1.4.1 Coordinator Impersonation via Unauthenticated Recovery","details":"### Impact\n\nRecovering coordinators do not verify the seed provided by the recovering party. This allows an attacker to set up a coordinator with a manifest that passes validation, but with a secret seed controlled by the attacker. \n\nIf network traffic is redirected from the legitimate coordinator to the attacker's coordinator, a workload owner is susceptible to impersonation if either \n\n* they `set` a new manifest and don't compare the root CA cert with the existing one (this is the default of the `contrast` CLI) or\n* they `verify` the coordinator and don't compare the root CA cert with a trusted reference.\n\nUnder these circumstances, the attacker can:\n\n* Issue certificates that chain back to the attacker coordinator's root CA.\n* Recover arbitrary workload secrets of workloads deployed after the attack.\n\nThis issue does **not** affect the following:\n\n* secrets of the legitimate coordinator (seed, workload secrets, CA)\n* integrity of workloads, even when used with the rogue coordinator\n* certificates chaining back to the mesh CA\n\n### Patches\n\nThis issue is patched in Contrast v1.4.1.\n\n### Workarounds\n\nThe issue can be avoided by verifying the coordinator root CA cert against expectations.\n\n* At the first `set` call, keep a copy of the CA cert returned by the coordinator.\n* After subsequent `set` or `verify` calls, compare the returned CA cert with the backup copy. If it matches bit-for-bit, the coordinator is legitimate.","published":"2026-09-27T01:28:27.915Z","modified":"2026-10-28T02:30:58.404184183Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Go","name":"github.com/edgelesssys/contrast","fixedVersion":"1.4.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71426.json"},{"type":"ADVISORY","url":"https://github.com/edgelesssys/contrast/security/advisories/GHSA-vqv5-385r-2hf8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-71426"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/contrast-before-1.4.1-coordinator-impersonation-via-unauthenticated-recovery"},{"type":"PACKAGE","url":"https://github.com/edgelesssys/contrast"},{"type":"WEB","url":"https://pkg.go.dev/vuln/GO-2025-3455"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:58.404184183Z"}}