CVE-2026-35058

Improper Packet Length Validation in OpenVPN's tls-crypt-v2 Leads to DoS

Published Jun 8, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Description
Improper validation of packet length during tls-crypt-v2 key extraction in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows authenticated attackers to trigger a fatal assertion and cause a denial of service via a specially crafted packet.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4653-1 openvpn security update
Debian DSA Debian DSA DSA-6289-1 openvpn security update
Ubuntu USN Ubuntu USN USN-8286-1 OpenVPN vulnerabilities
History
Type Values Removed Values Added
CPEs cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Type Values Removed Values Added
Title Improper Packet Length Validation in OpenVPN's tls-crypt-v2 Leads to DoS
First Time appeared Openvpn
Openvpn openvpn
Vendors & Products Openvpn
Openvpn openvpn
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Improper validation of packet length during tls-crypt-v2 key extraction in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows authenticated attackers to trigger a fatal assertion and cause a denial of service via a specially crafted packet.
Weaknesses CWE-617
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
OpenVPN
Published
Updated
Jun 8, 2026, 7:49 PM
Reserved
Apr 13, 2026, 10:28 AM
Status
Analyzed
Published
Jun 8, 2026, 8:17 PM
Modified
Aug 11, 2026, 1:11 PM