# Keylime has a hardcoded attestation challenge nonce that allows replay attacks

Advisory record · `GHSA-q8w6-w55c-ccv5`

- **Identifiers:** `GHSA-q8w6-w55c-ccv5` · `CVE-2026-6420` · `PYSEC-2026-2548`
- **State:** Confirmed
- **Severity:** CVSS 6.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-294](https://cwe.mitre.org/data/definitions/294.html) · [CWE-329](https://cwe.mitre.org/data/definitions/329.html) · [CWE-547](https://cwe.mitre.org/data/definitions/547.html) · [CWE-1241](https://cwe.mitre.org/data/definitions/1241.html)
- **Tags:** [Authentication bypass](https://agentprime.io/advisories/tag/auth-bypass.md) · [CWE-329](https://agentprime.io/advisories/tag/cwe-329.md) · [CWE-547](https://agentprime.io/advisories/tag/cwe-547.md) · [CWE-1241](https://agentprime.io/advisories/tag/cwe-1241.md)
- **Published:** 11 May 2026
- **Updated:** 13 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 11 May 2026, 14:42 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `keylime` (PyPI): affected `>=7.14.0, <7.14.2`; fixed in `7.14.2`

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0012, the 1st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 6 May 2026, 10:19 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-6420)
- 6 May 2026, 11:16 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-6420)
- 31 Oct 2026, 15:01 UTC: First seen by agentprime
- 31 Oct 2026, 15:01 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-q8w6-w55c-ccv5)

## Sources

- [GitHub Advisory Database: GHSA-q8w6-w55c-ccv5](https://github.com/advisories/GHSA-q8w6-w55c-ccv5)
- [OSV: GHSA-q8w6-w55c-ccv5](https://osv.dev/vulnerability/GHSA-q8w6-w55c-ccv5)
- <https://github.com/keylime/keylime/security/advisories/GHSA-q8w6-w55c-ccv5>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-6420>
- <https://access.redhat.com/security/cve/CVE-2026-6420>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2458889>
- <https://github.com/keylime/keylime>

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-q8w6-w55c-ccv5>, 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-q8w6-w55c-ccv5/>. Everything for agents: <https://agentprime.io/llms.txt>.