medium6.3
CVE-2026-6420
Keylime has a hardcoded attestation challenge nonce that allows replay attacks
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | keylime | >= 7.14.0, <= 7.14.1 | 7.14.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/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://access.redhat.com/errata/RHSA-2026:28582