UBUNTU-CVE-2026-53583

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Source
https://ubuntu.com/security/CVE-2026-53583
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53583.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-53583
Upstream
Published
2026-08-20T19:16:00Z
Modified
2026-09-02T19:36:19Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, verify_server_cert in src/libgit2/streams/openssl.c uses an inverted !!memcmp result in the GEN_IPADD branch when comparing an IP-literal host with a certificate IP SubjectAltName. OpenSSL builds reject matching IP addresses and accept mismatched IP addresses, allowing a network attacker with a CA-trusted certificate containing any IP SubjectAltName to intercept libgit2 connections to IP-literal HTTPS URLs. DNS SubjectAltName validation and non-OpenSSL TLS backends are not affected. This issue is fixed in versions 1.8.6 and 1.9.5.

References

Affected packages

Ubuntu:24.04:LTS
libgit2

Package

Name
libgit2
Purl
pkg:deb/ubuntu/libgit2?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.5.1+ds-1ubuntu1
1.7.1+ds-2ubuntu1
1.7.2+ds-1ubuntu1
1.7.2+ds-1ubuntu2
1.7.2+ds-1ubuntu3
1.7.2+ds-1ubuntu3.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libgit2-1.7",
            "binary_version": "1.7.2+ds-1ubuntu3.1"
        },
        {
            "binary_name": "libgit2-fixtures",
            "binary_version": "1.7.2+ds-1ubuntu3.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53583.json"
Ubuntu:26.04:LTS
libgit2

Package

Name
libgit2
Purl
pkg:deb/ubuntu/libgit2?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.9.0+ds-2ubuntu2
1.9.1+ds-1ubuntu1
1.9.1+ds-1ubuntu1.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libgit2-1.9",
            "binary_version": "1.9.1+ds-1ubuntu1.1"
        },
        {
            "binary_name": "libgit2-fixtures",
            "binary_version": "1.9.1+ds-1ubuntu1.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53583.json"
Ubuntu:Pro:14.04:LTS
libgit2

Package

Name
libgit2
Purl
pkg:deb/ubuntu/libgit2?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.19.0-2
0.19.0-2ubuntu0.4
0.19.0-2ubuntu0.4+esm1
0.19.0-2ubuntu0.4+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libgit2-0",
            "binary_version": "0.19.0-2ubuntu0.4+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53583.json"
Ubuntu:Pro:16.04:LTS
libgit2

Package

Name
libgit2
Purl
pkg:deb/ubuntu/libgit2?arch=source&distro=esm-apps-legacy%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.22.2-2
0.23.1-1
0.24.1-2
0.24.1-2ubuntu0.2
0.24.1-2ubuntu0.2+esm1
0.24.1-2ubuntu0.2+esm2
0.24.1-2ubuntu0.2+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libgit2-24",
            "binary_version": "0.24.1-2ubuntu0.2+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53583.json"
Ubuntu:Pro:18.04:LTS
libgit2

Package

Name
libgit2
Purl
pkg:deb/ubuntu/libgit2?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.25.1+really0.24.6-1
0.26.0+dfsg.1-1.1
0.26.0+dfsg.1-1.1build1
0.26.0+dfsg.1-1.1ubuntu0.2
0.26.0+dfsg.1-1.1ubuntu0.2+esm1
0.26.0+dfsg.1-1.1ubuntu0.2+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libgit2-26",
            "binary_version": "0.26.0+dfsg.1-1.1ubuntu0.2+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53583.json"
Ubuntu:Pro:20.04:LTS
libgit2

Package

Name
libgit2
Purl
pkg:deb/ubuntu/libgit2?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.27.7+dfsg.1-0.2build1
0.28.3+dfsg.1-1
0.28.3+dfsg.1-1ubuntu1
0.28.4+dfsg.1-2
0.28.4+dfsg.1-2ubuntu0.1
0.28.4+dfsg.1-2ubuntu0.1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libgit2-28",
            "binary_version": "0.28.4+dfsg.1-2ubuntu0.1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53583.json"
Ubuntu:Pro:22.04:LTS
libgit2

Package

Name
libgit2
Purl
pkg:deb/ubuntu/libgit2?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.1.0+dfsg.1-4
1.1.0+dfsg.1-4.1
1.1.0+dfsg.1-4.1build1
1.1.0+dfsg.1-4.1ubuntu0.1
1.1.0+dfsg.1-4.1ubuntu0.1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libgit2-1.1",
            "binary_version": "1.1.0+dfsg.1-4.1ubuntu0.1+esm1"
        },
        {
            "binary_name": "libgit2-fixtures",
            "binary_version": "1.1.0+dfsg.1-4.1ubuntu0.1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53583.json"