# CVE-2026-55588

## Summary

- **CVE ID:** CVE-2026-55588
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
- **CWE:** CWE-400, CWE-674, CWE-835
- **Published:** Aug 25, 2026
- **Last Modified:** Aug 27, 2026

## Description

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.

## Affected Products

- oras-project — oras (< 1.3.3)

## References

- [CNA](https://github.com/oras-project/oras/security/advisories/GHSA-298f-872v-2rcx)
- [CNA](https://github.com/oras-project/oras/commit/440eb65d07a0631f131944d28e7c29d562ec17f3)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 22.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._