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

Advisory record · `GHSA-298f-872v-2rcx`

- **Identifiers:** `GHSA-298f-872v-2rcx` · `CVE-2026-55588` · `GO-2026-6317`
- **State:** Confirmed
- **Severity:** CVSS 6.5 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html) · [CWE-674](https://cwe.mitre.org/data/definitions/674.html) · [CWE-835](https://cwe.mitre.org/data/definitions/835.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 28 Aug 2026
- **Updated:** 2 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 28 Aug 2026, 18:19 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `oras.land/oras` (Go): affected `<1.3.3`; fixed in `1.3.3`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> GHSA-298f-872v-2rcx: The ORAS CLI (oras.land/oras) before 1.3.3 can be made to recurse without limit when a registry returns a cyclic referrer graph, because recursive referrer traversal does not track visited descriptors. An attacker running a malicious OCI registry can trigger this against users of oras discover, backup, or restore, causing high CPU and memory use and a hang or failure. Upgrade to oras.land/oras 1.3.3 or later; no workaround is listed.

Written 6 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.5 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0054, the 45th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:47 UTC: First seen by agentprime
- 31 Oct 2026, 14:47 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-298f-872v-2rcx)

## Sources

- [GitHub Advisory Database: GHSA-298f-872v-2rcx](https://github.com/advisories/GHSA-298f-872v-2rcx)
- [OSV: GHSA-298f-872v-2rcx](https://osv.dev/vulnerability/GHSA-298f-872v-2rcx)
- <https://github.com/oras-project/oras/security/advisories/GHSA-298f-872v-2rcx>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-55588>
- <https://github.com/oras-project/oras/commit/440eb65d07a0631f131944d28e7c29d562ec17f3>
- <https://github.com/oras-project/oras>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-298f-872v-2rcx>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-298f-872v-2rcx/>. Everything for agents: <https://agentprime.io/llms.txt>.