Red Hat Enterprise Linux 10: Key Exchange without Entity Authentication
CVE-2026-1709 is a critical-severity key exchange without entity authentication vulnerability in Red Hat Enterprise Linux 10 from Red Hat, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 5.71% chance of exploitation within 30 days, which is in the top 6.85% of all scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update Keylime to 7.12.0 or a later version.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 9 | Not specified in the record | Not stated |
| Red Hat | Enterprise Linux | 9.0; 10.0 | Not stated |
| Red Hat | Enterprise Linux EUS | 10.0 | Not stated |
| Red Hat | Enterprise Linux For Arm 64 | 9.0_aarch64; 10.0_aarch64 | Not stated |
| Red Hat | Enterprise Linux For Arm 64 EUS | 10.0_aarch64 | Not stated |
| Red Hat | Enterprise Linux For IBM Z Systems | 9.0_s390x; 10.0_s390x | Not stated |
| Red Hat | Enterprise Linux For IBM Z Systems EUS | 10.0_s390x | Not stated |
| Red Hat | Enterprise Linux For Power Little Endian | 9.0_ppc64le; 10.0_ppc64le | Not stated |
| Red Hat | Enterprise Linux For Power Little Endian EUS | 10.0_ppc64le | Not stated |
| Keylime | Keylime | before 7.12.0 | 7.12.0 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 9.4 | Critical | CNA (redhat.com) |
| CVSS 3.1 | 9.8 | Critical | NVD |
| CVSS 3.1 | 9.4 | Critical | CNA |
Official 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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Key Exchange without Entity Authentication
The product performs a key exchange with an actor without verifying the identity of that actor.
How developers prevent this class of flaw
- Ensure that proper authentication is included in the system design.
- Understand and properly implement all checks necessary to ensure the identity of entities involved in encrypted communications.
More Key Exchange without Entity Authentication vulnerabilities (CWE-322)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- access.redhat.com/errata/RHSA-2026:2224Third Party Advisory
- access.redhat.com/errata/RHSA-2026:2225Third Party Advisory
- access.redhat.com/errata/RHSA-2026:2298Third Party Advisory
- access.redhat.com/security/cve/CVE-2026-1709Third Party Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2435514Issue Tracking, Third Party Advisory
Other vulnerabilities in Red Hat Enterprise Linux 10
- 8.8 High severity
- 7.5 High severity
- 7.5 High severity
- 7.9 High severity
- 7.3 High severity
- 7.5 High severity
Recent Key Exchange without Entity Authentication vulnerabilities
- 8.1 High severity
- 8.7 High severity
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