CVE-2026-1709
Description
A flaw was found in Keylime. The Keylime registrar, since version 7.12.0, does not enforce client-side Transport Layer Security (TLS) authentication. This authentication bypass vulnerability allows unauthenticated clients with network access to perform administrative operations, including listing agents, retrieving public Trusted Platform Module (TPM) data, and deleting agents, by connecting without presenting a client certificate.
Statement
This is a Critical authentication bypass flaw in the Keylime registrar, affecting versions 7.12.0 and later. The registrar fails to enforce client-side TLS authentication, enabling unauthenticated clients with network access to perform administrative actions such as listing or deleting agents and retrieving TPM data. Exploitation requires direct network access to the registrar's HTTPS port (default 8891). Keylime packages shipped in RHEL-9.6 and earlier are not affected, as they never shipped the version which introduced this vulnerability.
Mitigation
Restrict network access to the Keylime registrar's HTTPS port (default 8891) to only trusted verifier and tenant hosts using firewall rules.
Alternatively, deploy a reverse proxy (e.g., Nginx, HAProxy) in front of the registrar to enforce client certificate authentication.
Ensure any changes to firewall rules or proxy configurations are reloaded or services are restarted for the mitigation to take effect.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 9.4 | 9.8 | 9.4 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | Low | High | Low |
| Integrity Impact | High | High | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
No authentication takes place in this process, bypassing an assumed protection of encryption.
Confidentiality
Technical Impact: Read Application Data
The encrypted communication between a user and a trusted host may be subject to sniffing by any actor in the communication path.
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