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Ubuntu 24.04 LTS / 26.04 LTS : libgit2 vulnerability (USN-8907-1)

medium Nessus Plugin ID 365460

Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 24.04 LTS / 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8907-1 advisory.

 It was discovered that libgit2 incorrectly handled IP address SubjectAltName verification in TLS certificate validation. A remote attacker with a CA-trusted certificate could possibly use this issue to perform a machine-in-the-middle attack, leading to the exposure of sensitive information.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected libgit2-1.7, libgit2-1.9 and / or libgit2-fixtures packages.

See Also

https://ubuntu.com/security/notices/USN-8907-1

Plugin Details

Severity: Medium

ID: 365460

File Name: ubuntu_USN-8907-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/13/2026

Updated: 10/13/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.1

Percentile: 7.93

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2026-53583

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libgit2-1.7, p-cpe:/a:canonical:ubuntu_linux:libgit2-1.9, p-cpe:/a:canonical:ubuntu_linux:libgit2-fixtures

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 10/8/2026

Vulnerability Publication Date: 7/23/2026

Reference Information

CVE: CVE-2026-53583

USN: 8907-1