{"id":"CVE-2026-55588","aliases":["GHSA-298f-872v-2rcx"],"url":"https://o3.security/vulnerability/CVE-2026-55588","summary":"ORAS CLI: Cyclic Referrer Graph Can Cause Unbounded Recursion and Resource Consumption","details":"ORAS (OCI Registry As Storage) is a CLI and library for managing artifacts in OCI registries. In ORAS CLI versions up to and including 1.3.2, the recursive referrer traversal does not track visited descriptors, so a malicious OCI registry that returns a cyclic referrer graph causes unbounded recursion and memory growth. This affects oras discover, whose recursive traversal is enabled by default because the --depth option defaults to 0 (unlimited), as well as the recursive referrer counting used by the oras backup and oras restore workflows. A cyclic graph can be as simple as A referring to B and B referring back to A. A malicious registry can use this to cause a client-side denial of service, exhausting CPU and memory and hanging automation or CI/CD pipelines that run ORAS against untrusted registry metadata. The vulnerability does not extend to code execution, artifact substitution, or integrity bypass. This issue has been fixed in version 1.3.3.","published":"2026-08-25T20:32:18.677Z","modified":"2026-08-28T03:30:53.626632211Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Go","name":"oras.land/oras","fixedVersion":"1.3.3"}],"fix":{"url":"https://github.com/oras-project/oras/commit/440eb65d07a0631f131944d28e7c29d562ec17f3","label":"oras-project/oras@440eb65"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55588.json"},{"type":"ADVISORY","url":"https://github.com/oras-project/oras/security/advisories/GHSA-298f-872v-2rcx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55588"},{"type":"FIX","url":"https://github.com/oras-project/oras/commit/440eb65d07a0631f131944d28e7c29d562ec17f3"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-28T03:30:53.626632211Z"}}