# Canonical ADSys Uses a Less Trusted Source

Advisory record · `GHSA-crm4-q7v4-c2r2`

- **Identifiers:** `GHSA-crm4-q7v4-c2r2` · `CVE-2026-12249` · `GO-2026-6543`
- **State:** Confirmed
- **Severity:** CVSS 9.0 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-348](https://cwe.mitre.org/data/definitions/348.html)
- **Tags:** [CWE-348](https://agentprime.io/advisories/tag/cwe-348.md)
- **Published:** 22 Jun 2026
- **Updated:** 28 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 22 Jun 2026, 18:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.0: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `github.com/ubuntu/adsys` (Go): affected `<0.16.3-0.20250318112551-8b1939f96d38`; fixed in `0.16.3-0.20250318112551-8b1939f96d38`

## 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

- 9.0 Critical, CVSS 4.0: `CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/S:N/AU:Y/R:I/V:D/RE:L/U:Red`, from CNA (canonical)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0014, the 3rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:12 UTC: First seen by agentprime
- 31 Oct 2026, 14:12 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-crm4-q7v4-c2r2)

## Sources

- [GitHub Advisory Database: GHSA-crm4-q7v4-c2r2](https://github.com/advisories/GHSA-crm4-q7v4-c2r2)
- [OSV: GHSA-crm4-q7v4-c2r2](https://osv.dev/vulnerability/GHSA-crm4-q7v4-c2r2)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-12249>
- <https://github.com/ubuntu/adsys/commit/8b1939f96d3827b4426eb06c1ced5bf317b0a99d>
- <https://github.com/ubuntu/adsys>
- <https://github.com/ubuntu/adsys/releases/tag/v0.16.3>
- <https://ubuntu.com/security/CVE-2026-12249>

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-crm4-q7v4-c2r2>, 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-crm4-q7v4-c2r2/>. Everything for agents: <https://agentprime.io/llms.txt>.