---
id: CVE-2026-6420
title: A flaw was found in Keylime
summary: >-
  A flaw was found in Keylime. An attacker with root access on an enrolled
  monitored machine, where the Keylime agent runs, can exploit a vulnerability
  in the Keylime verifier. The verifier uses a hardcoded challenge nonce for
  Trusted Plat…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L'
cwe:
  - CWE-1241
published: '2026-05-06'
updated: '2026-06-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-6420'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:28582'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-6420'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2458889'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00176
epssPercentile: 0.06326
ingestedAt: '2026-06-29T13:24:34.837Z'
---

## Overview

A flaw was found in Keylime. An attacker with root access on an enrolled monitored machine, where the Keylime agent runs, can exploit a vulnerability in the Keylime verifier. The verifier uses a hardcoded challenge nonce for Trusted Platform Module (TPM) quote attestation instead of a cryptographically random value. This allows the attacker to stockpile valid TPM quotes and replay them to evade detection after compromising the system. This issue affects only the push model deployment.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.