Vulnerability in oras.land/oras (CVE-2026-55588)
Summary
Vulnerability in oras.land/oras (CVE-2026-55588). Risk of unauthorized operations or information disclosure. Exploitable via discover. Mitigation: upgrade to 1.3.3 or later.
Original description
The description as published by the source.
Summary
A malicious OCI registry can return a cyclic referrer graph (e.g. A -> A or A -> B -> A). The ORAS CLI's recursive referrer traversal does not track visited descriptors, so a cycle causes unbounded recursion and memory growth — a client-side denial of service.
This affects oras discover (recursive referrer traversal) and the recursive referrer counting used by oras backup and oras restore. Because oras discover --depth defaults to 0 (unlimited), discover is affected out of the box.
Note: This advisory covers only the ORAS CLI (
oras.land/oras). The related Referrers API pagination loop in theoras-golibrary is tracked in a separate advisory on the oras-go repository.
Details
In oras discover, recursive referrer traversal follows discovered referrers without maintaining a visited-descriptor set.
Simplified flow:
runDiscover
-> fetchAllReferrers(root)
-> registry.Referrers(root)
-> for each referrer:
fetchAllReferrers(referrer)
A malicious registry can create cyclic graphs such as:
A -> A
or
A -> B -> A
Because traversal does not track previously visited descriptors, recursion never reaches a terminating condition.
Similarly, the recursive counting logic (graph.RecursiveFindReferrers, used by the backup and restore workflows) accumulates descriptors without cycle detection, causing unbounded memory growth.
#…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-55588 has been found in oras.land/oras.
Attackers can target a specific entry point like discover over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 6.5/10.
What to do: upgrade oras.land/oras to 1.3.3 or later.
If unsure, ask your IT team or search "oras.land/oras CVE-2026-55588" on the vendor's site.
CVE-2026-55588 (oras.land/oras) — CWE-400 / CVSS v3 6.5
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: discover / graph.RecursiveFindReferrers / backup / restore
Patched: 1.3.3 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-400) exists in oras.land/oras. Attackers reach the vulnerable code path via discover without authentication.
Check the vendor advisory for the affected versions of oras.land/oras. Attack surface: discover / graph.RecursiveFindReferrers / backup / restore.
Severity: Medium (CVSS 6.5/10). Risk of unauthorized operations or information disclosure.
Update to 1.3.3.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'oras.land/oras' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'oras.land/oras' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
oras.land/orasを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade oras.land/oras to 1.3.3ステージング環境で 1.3.3 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-55588 oras
- Ubuntu UBUNTU-CVE-2026-55588 oras
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com