CVE-2026-40215

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Summary

CVECVE-2026-40215
StatePUBLISHED
AssignerOpenVPN
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-08 21:16:45 UTC
Updated2026-06-09 02:08:28 UTC
DescriptionA race condition in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows remote attackers to potentially cause a server crash or leak heap memory via a use-after-free triggered during TLS session promotion.

Risk And Classification

Primary CVSS: v4.0 6.1 MEDIUM from [email protected]

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:L/SI:N/SA:L/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: 0.004810000 probability, percentile 0.374980000 (date 2026-06-15)

Problem Types: CWE-125 | CWE-416 | CWE-125 CWE-125 Out-of-bounds read | CWE-416 CWE-416 Use after free

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary6.1MEDIUMCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:L/SI:N/SA:L/E:X/C...
4.0CNACVSS6.1MEDIUMCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:L/SI:N/SA:L

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
None
Availability
High
Sub Conf.
Low
Sub Integrity
None
Sub Availability
Low

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:L/SI:N/SA:L/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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenVPN OpenVPN affected 2.6.0 2.6.19 semver Not specified
CNA OpenVPN OpenVPN affected 2.7_alpha1 2.7.1 semver Not specified

References

ReferenceSourceLinkTags
community.openvpn.net/ReleaseHistory [email protected] community.openvpn.net
community.openvpn.net/ReleaseHistory [email protected] community.openvpn.net
community.openvpn.net/Security%20Announcements/CVE-2026-40215 [email protected] community.openvpn.net
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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