The Git Smart Protocol support in libgit2 before 0.24.6 and 0.25.x before 0.25.1 allows remote attackers to cause a denial of service (NULL pointer dereference) via an empty packet line.

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.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - Buffer overflow in the git_pkt_parse_line function in transports/smart_pkt.c in the Git Smart Protocol
    support in libgit2 before 0.24.6 and 0.25.x before 0.25.1 allows remote attackers to have unspecified
    impact via a crafted non-flush packet. (CVE-2016-10128)

  - The Git Smart Protocol support in libgit2 before 0.24.6 and 0.25.x before 0.25.1 allows remote attackers
    to cause a denial of service (NULL pointer dereference) via an empty packet line. (CVE-2016-10129)

  - The http_connect function in transports/http.c in libgit2 before 0.24.6 and 0.25.x before 0.25.1 might
    allow man-in-the-middle attackers to spoof servers by leveraging clobbering of the error variable.
    (CVE-2016-10130)

This update for libgit2 fixes the several issues.

These security issues were fixed :

  - CVE-2016-10128: Additional sanitization prevent some     edge cases in the Git Smart Protocol which can lead to     reading outside of a buffer (bsc#1019036).

  - CVE-2016-10129: Additional sanitization prevent some     edge cases in the Git Smart Protocol which can lead to     reading outside of a buffer (bsc#1019036).

  - CVE-2016-10130: When using the custom certificate     callback or when using pygit2 or git2go a attacker could     have caused an invalid certificate to be accepted     (bsc#1019037).

  - CVE-2017-5338: When using the custom certificate     callback or when using pygit2 or git2go a attacker could     have caused an invalid certificate to be accepted     (bsc#1019037).

  - CVE-2017-5339: When using the custom certificate     callback or when using pygit2 or git2go a attacker could     have caused an invalid certificate to be accepted     (bsc#1019037).

This update was imported from the SUSE:SLE-12-SP2:Update update project.

This update for libgit2 fixes the following issues :

  - CVE-2016-10130: When using the custom certificate     callback or when using pygit2 or git2go a attacker could     have caused an invalid certificate to be accepted     (bsc#1019037).

  - CVE-2017-5338: When using the custom certificate     callback or when using pygit2 or git2go a attacker could     have caused an invalid certificate to be accepted     (bsc#1019037).

  - CVE-2017-5339: When using the custom certificate     callback or when using pygit2 or git2go a attacker could     have caused an invalid certificate to be accepted     (bsc#1019037).

  - CVE-2016-10128: Additional sanitization prevent some     edge cases in the Git Smart Protocol which can lead to     reading outside of a buffer (bsc#1019036).

  - CVE-2016-10129: Additional sanitization prevent some     edge cases in the Git Smart Protocol which can lead to     reading outside of a buffer (bsc#1019036).

ID	Name	Product	Family	Type	Severity
365444	Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : libgit2 vulnerabilities (USN-8628-1)	Nessus	Ubuntu Local Security Checks	Local	critical
405192	Alpine: libgit2-1.1: security update to 0.25.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	critical
405192	Alpine: libgit2-1.1: security update to 0.25.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	critical
405187	Alpine: libgit2-1.0: security update to 0.25.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	critical
405187	Alpine: libgit2-1.0: security update to 0.25.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	critical
405180	Alpine: libgit2-0.27: security update to 0.25.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	critical
405180	Alpine: libgit2-0.27: security update to 0.25.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	critical
405178	Alpine: multiple libgit2 packages: security update to 0.25.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	critical
405178	Alpine: multiple libgit2 packages: security update to 0.25.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	critical
405177	Alpine: multiple libgit2 packages: security update to 0.24.6-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	critical
405177	Alpine: multiple libgit2 packages: security update to 0.24.6-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	critical
400935	Alpine: multiple libgit2 packages: security update to 0.24.3-r1 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	critical
400935	Alpine: multiple libgit2 packages: security update to 0.24.3-r1 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	critical
97282	openSUSE Security Update : libgit2 (openSUSE-2017-262)	Nessus	SuSE Local Security Checks	Local	critical
97074	openSUSE Security Update : libgit2 (openSUSE-2017-213)	Nessus	SuSE Local Security Checks	Local	critical

Detections

Analytics

CVE-2016-10129

high

Tenable Plugins

critical

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