CVE-2026-55588
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
ORAS CLI up to version 1.3.2 has a vulnerability to uncontrolled recursion during referrer traversal when a malicious OCI registry returns a cyclic referrer graph. This causes unbounded memory growth and process hang, which can be exploited for a client-side denial of service.
Risk Assessment
An attacker can exhaust CPU and memory resources, hanging automation or CI/CD pipelines that run ORAS against untrusted registry metadata.
Recommendation
Update ORAS CLI to version 1.3.3 or later, which includes the fix.
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Original NVD description (English source)
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.

