Critical OpenVPN Vulnerabilities Affecting Ubuntu Systems

Critical OpenVPN Vulnerabilities Affecting Ubuntu Systems

First seen 14 Jul 2026, 17:57 UTC •UbuntuLinuxsecuritylaunchpad.net •94% similarity •74.0

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Multiple vulnerabilities were discovered in OpenVPN affecting Ubuntu 24.04 LTS and 26.04 LTS. Key issues include a 1-byte buffer overrun (CVE-2026-11771) that could lead to denial of service or arbitrary code execution. Other vulnerabilities include incorrect metadata handling (CVE-2026-12932) and use-after-free errors (CVE-2026-12996, CVE-2026-13117, CVE-2026-13122). These flaws allow attackers to crash OpenVPN or extract sensitive information. The vulnerabilities were published on July 6, 2026, and require immediate patching. Users are advised to update to the latest OpenVPN versions to mitigate risks.

Key Points: • OpenVPN vulnerabilities could lead to denial of service or arbitrary code execution. • Affected systems include Ubuntu 24.04 LTS and 26.04 LTS. • Immediate updates are necessary to address the critical security issues.

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Timeline

2026-07-06
CVE-2026-11771 published
A 1-byte buffer overrun in OpenVPN could allow denial of service or arbitrary code execution.
Ubuntu
2026-07-06
CVE-2026-12932 published
OpenVPN incorrectly handled metadata, potentially exposing sensitive information.
Ubuntu
2026-07-06
CVE-2026-12996 published
OpenVPN had a use-after-free in ack_write_buf handling, leading to potential crashes.
Ubuntu
2026-07-06
CVE-2026-13698 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2026-07-06
CVE-2026-13122 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2026-07-14
Security advisory published
Ubuntu released USN-8540-1 detailing multiple OpenVPN vulnerabilities and recommended updates.
Linuxsecurity

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