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Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : libgit2 vulnerabilities (USN-8628-1)

critical Nessus Plugin ID 365444

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8628-1 advisory.

 It was discovered that libgit2 incorrectly handled the Git Smart Protocol. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-10128)

 It was discovered that libgit2 incorrectly handled empty packet lines in the Git Smart Protocol. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-10129)

 It was discovered that libgit2 incorrectly handled error reporting in the HTTP transport. A remote attacker could possibly use this issue to spoof servers. This issue only affected Ubuntu 16.04 LTS.
 (CVE-2016-10130)

 It was discovered that libgit2 incorrectly handled certain crafted ng packets. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2018-15501)

 Krishna Ram Prakash R and Vivek Parikh discovered that libgit2 incorrectly handled certain repository index files. A local attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 18.04 LTS. (CVE-2018-8098)

 Krishna Ram Prakash R and Vivek Parikh discovered that libgit2 incorrectly handled certain repository index files. A local attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2018-8099)

 Micha Majchrowicz and Marcin Wyczechowski discovered that libgit2 incorrectly handled submodule paths. A remote attacker could possibly use this issue to write files outside the working tree. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-53584)

 Micha Majchrowicz and Marcin Wyczechowski discovered that libgit2 incorrectly handled delta object result-size headers. A remote attacker could possibly use this issue to cause libgit2 to consume excessive memory, leading to a denial of service. (CVE-2026-53585)

 Thai Son Dinh discovered that libgit2 incorrectly handled HTTP redirects. A remote attacker could possibly use this issue to leak credentials to an offsite redirect target. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-53586)

 It was discovered that libgit2 incorrectly handled certain capability buffers in the smart protocol. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-53587)

Tenable has extracted the preceding description block directly from the Ubuntu 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

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8628-1

Plugin Details

Severity: Critical

ID: 365444

File Name: ubuntu_USN-8628-1.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: Medium

Score: 4.9

Percentile: 58.25

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

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

CVSS Score Source: CVE-2016-10128

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libgit2-0, p-cpe:/a:canonical:ubuntu_linux:libgit2-1.1, p-cpe:/a:canonical:ubuntu_linux:libgit2-1.7, p-cpe:/a:canonical:ubuntu_linux:libgit2-1.9, p-cpe:/a:canonical:ubuntu_linux:libgit2-26, p-cpe:/a:canonical:ubuntu_linux:libgit2-28, p-cpe:/a:canonical:ubuntu_linux:libgit2-fixtures

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/12/2026

Vulnerability Publication Date: 1/10/2017

Reference Information

CVE: CVE-2016-10128, CVE-2016-10129, CVE-2018-15501, CVE-2018-8098, CVE-2018-8099, CVE-2026-53584, CVE-2026-53585, CVE-2026-53586, CVE-2026-53587

USN: 8628-1