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CVE-2026-55588— ORAS CLI: Cyclic Referrer Graph Can Cause Unbounded Recursion and Resource Consumption

Quick assessment

Affected
oras-project oras
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ORAS（OCI 注册表存储，全称 OCI Registry As Storage）是一个用于在 OCI 注册表中管理工件的命令行工具（CLI）和库。在 ORAS CLI 1.3.2 及更早版本中，递归引用者遍历（recursive referrer traversal）功能未跟踪已访问的描述符（descriptors）。因此，当恶意 OCI 注册表返回一个循环的引用者图时，会导致无限递归和内存持续增长。 此漏洞影响 命令，其递归遍历默认启用（因为 选项默认值为 0，表示无限制），同时也影响 和 工作流中使用的递归

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-55588

Vulnerability Information
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Vulnerability Title
ORAS CLI: Cyclic Referrer Graph Can Cause Unbounded Recursion and Resource Consumption
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
oras-project oras < 1.3.3 -

II. Public POCs for CVE-2026-55588

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III. Intelligence Information for CVE-2026-55588

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Patches & Fixes for CVE-2026-55588 (1)

Vendor Advisories for CVE-2026-55588 (1)

IV. Related Vulnerabilities

Same product: oras
Same vendor: oras-project
Same weakness: CWE-400

V. Comments for CVE-2026-55588

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