Is there a patch available for EUVD-2026-63494?

Yes, a patch is available for EUVD-2026-63494. Update the affected software to the latest version immediately.

Ubuntu TLS Stack EUVD-2026-63494

Q: What is the CVSS score of EUVD-2026-63494?

EUVD-2026-63494 has a CVSS 4.0 base score of 9.3 (Critical). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.3%.

| CVE-2026-73251 CRITICAL

Improper Certificate Validation (CWE-295)

2026-08-14 vendor:ubuntu

Information Disclosure

9.3

CVSS 4.0 · Vendor: vendor:ubuntu

Severity by source

Vendor (vendor:ubuntu) PRIMARY

9.3 CRITICAL

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (vendor:ubuntu) · only source for this CVE.

CVSS VectorVendor: vendor:ubuntu

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Patch available

Aug 20, 2026 - 18:03 EUVD

Analysis Generated

Aug 14, 2026 - 22:39 vuln.today

DescriptionCVE.org

[Built-in TLS certificate-chain verification with CA bundles]

AnalysisAI

CVE-2026-73251 concerns built-in TLS certificate-chain verification involving CA bundles, reported by Ubuntu. The available intelligence is critically sparse - no description of the actual flaw, no CVSS vector, no CWE classification, and no references have been provided. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Unknown

Exploit

Unknown

Impact

Unknown

Access

Unknown

Exploit

Unknown

Impact

Unknown

Vulnerability AssessmentAI

Exploitation	No exploitation conditions can be extracted from the supplied data - the description is a feature label, not a flaw description. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	Risk cannot be meaningfully assessed from the available data. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	No exploit scenario can be constructed from the available data. The description does not identify the flaw type, attack vector, or required conditions. …
Remediation	No patch version, advisory URL, or workaround information was provided. … Detailed patch versions, workarounds, and compensating controls in full report.