Debian dsa-6453 : libgit2-1.9 - security update

high Nessus Plugin ID 338355

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6453 advisory.

- ------------------------------------------------------------------------- Debian Security Advisory DSA-6453-1 [email protected] https://www.debian.org/security/ Aron Xu August 20, 2026 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : libgit2 CVE ID : CVE-2026-5917 CVE-2026-53583 CVE-2026-53584 CVE-2026-53585 CVE-2026-53586 CVE-2026-53587 Debian Bug : 1144465

Multiple security issues were discovered in libgit2, a low-level Git library, which could result in the execution of arbitrary commands on a remote SSH server, disclosure of credentials, denial of service or the creation of directories outside a repository's working tree.

For the stable distribution (trixie), these problems have been fixed in version 1.9.0+ds-2+deb13u1.

We recommend that you upgrade your libgit2 packages.

For the detailed security status of libgit2 please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/libgit2

Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/

Mailing list: [email protected]

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

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

Solution

Upgrade the libgit2-1.9 packages.

Plugin Details

Severity: High

ID: 338355

File Name: debian_DSA-6453.nasl

Version: 1.2

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 8/20/2026

Updated: 8/27/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.17

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-5917

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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

CVSS Score Source: CVE-2026-53586

CVSS v4

Risk Factor: High

Base Score: 8.6

Threat Score: 6.1

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:13.0, p-cpe:/a:debian:debian_linux:libgit2-1.9, p-cpe:/a:debian:debian_linux:libgit2-dev, p-cpe:/a:debian:debian_linux:libgit2-fixtures

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/20/2026

Vulnerability Publication Date: 7/23/2026

Reference Information

CVE: CVE-2026-53583, CVE-2026-53584, CVE-2026-53585, CVE-2026-53586, CVE-2026-53587, CVE-2026-5917

Detections

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