Severity by source
Network-reachable TLS validation defect; AC:H because impact direction is unclear and requires specific code path; C/I/A:L reflecting partial trust bypass with uncertain scope.
Estimated by vuln.today — no official severity rating has been published for this CVE yet.
Lifecycle Timeline
2DescriptionCVE.org
[TLS certificate notAfter validated against hardcoded 2025-01-01 string]
AnalysisAI
TLS certificate expiry validation in an Ubuntu component uses a hardcoded date string '2025-01-01' instead of the current system time, causing certificate validity checks to produce incorrect results for any certificate whose notAfter field is evaluated against this static anchor. Affected systems may incorrectly accept expired certificates or reject valid ones depending on implementation logic. No CVSS score, CWE classification, KEV listing, or EPSS data is available at time of analysis.
Technical ContextAI
TLS certificate validation requires comparing the certificate's notAfter field against the current time at the moment of the handshake. A hardcoded date string ('2025-01-01') as the comparison anchor is a design defect - likely a leftover from testing or a misconfigured build - that causes the validity window check to be static rather than dynamic. The CWE classification has not been assigned, but this most closely resembles CWE-324 (Use of Key Past its Expiration Date) or CWE-295 (Improper Certificate Validation). No CPE strings were provided; the affected component within Ubuntu is not precisely identified from available data.
Affected ProductsAI
The affected product is identified only as a component within Ubuntu, reported by the Ubuntu vendor. No specific package name, version range, or CPE string was provided in the available intelligence. The hardcoded anchor date of 2025-01-01 suggests the defect would have become observable from that date onward. Administrators should consult Ubuntu Security Notices (USN) for the specific package and version range.
RemediationAI
No specific patch version or advisory URL was provided in the available data. Administrators should check Ubuntu Security Notices at ubuntu.com/security/notices for a USN addressing CVE-2026-52066 and apply the issued package update via apt-get update && apt-get upgrade. As a compensating control while awaiting patch availability, consider disabling or routing around the affected TLS validation component if it can be identified, but note this may break TLS enforcement entirely. Monitoring TLS handshake failures or unexpected certificate acceptance in logs may help detect active misbehavior. Vendor-released patch version not independently confirmed from available data.
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External POC / Exploit Code
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