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Fencer Vulns
medium 6.5

CVE-2026-55588 json

ORAS CLI: Cyclic Referrer Graph Can Cause Unbounded Recursion and Resource Consumption

published 2026-08-25 2 mo ago modified 2026-09-09 1 mo ago also GHSA-298f-872v-2rcx , GO-2026-6317 , EUVD-2026-66110

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

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.

Patch / fix

  • go oras.land/oras 1.3.3
  • oras Debian 14 1.3.3-1

debian advisories DEBIAN-CVE-2026-55588

  • govulncheck-vulndb SLES 16.0, SLES for SAP applications 16.0 0.0.20260902T191204-160000.1.1

suse advisories SUSE-SU-2026:23692-1SUSE-SU-2026:23712-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260902T191204-160000.1.1

opensuse advisories openSUSE-SU-2026:21812-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-55588 updated cvss 6.5

github.com/oras-project/oras: ORAS CLI: Denial of Service via cyclic referrer graph

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
GitHub 3.1 2.0 CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
go oras.land/oras
<1.3.3
1.3.3

Affected products

  • oras-project oras

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-674 Uncontrolled Recursion
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.