PT-2026-55942 · Openvpn · Openvpn

Published 2026-07-06 · Updated 2026-07-14 · CVE-2026-13122

Positive Technologies (AI Summary)

CVSS v4.0

5.9

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions OpenVPN versions 2.6.0 through 2.6.20 OpenVPN versions 2.7 alpha1 through 2.7.4

Description A remote attacker can cause a denial of service when the external-auth feature is enabled. This occurs by sending a malformed authentication token that triggers a reachable assertion, leading to a system crash.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

CVE-2026-13122

USN-8540-1

Affected Products

Openvpn

References · 16

• https://ubuntu.com/security/CVE-2026-12932 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8540-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-12996 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-13122 · Security Note
• https://ubuntu.com/security/CVE-2026-13698 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8540-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-13122 · Vendor Advisory
• https://community.openvpn.net/Security%20Announcements/CVE-2026-13122 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-13122 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-13122 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-11771 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-13117 · Vendor Advisory
• https://twitter.com/infoflowcloud/status/2074181982133665890 · Twitter Post
• https://twitter.com/CVEnew/status/2074180689763971182 · Twitter Post
• https://t.me/CVEtracker/59107 · Telegram Post