Home / mailings

PDF

[USN-8907-1] libgit2 vulnerability

Posted on 08 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8907-1
October 08, 2026

libgit2 vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS

Summary:

libgit2 could be made to expose sensitive information over the
network.

Software Description:
- libgit2: Portable C implementation of the Git core methods library

Details:

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.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
libgit2-1.9 1.9.1+ds-1ubuntu1.3

Ubuntu 24.04 LTS
libgit2-1.7 1.7.2+ds-1ubuntu3.3

In general, a standard system update will make all the necessary
changes.

References:
https://ubuntu.com/security/notices/USN-8907-1
CVE-2026-53583

Package Information:
https://launchpad.net/ubuntu/+source/libgit2/1.9.1+ds-1ubuntu1.3
https://launchpad.net/ubuntu/+source/libgit2/1.7.2+ds-1ubuntu3.3

--===============5397330639165270006==Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature

 

TOP