DEBIAN-CVE-2026-53583

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Source
https://security-tracker.debian.org/tracker/CVE-2026-53583
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53583.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-53583
Upstream
Published
2026-08-20T19:16:54Z
Modified
2026-09-10T08:47:34Z
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
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

Debian:12 / libgit2

Package

Name
libgit2
Purl
pkg:deb/debian/libgit2?arch=source&distro=bookworm

Affected ranges

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

Affected versions

1.*
1.5.1+ds-1
1.5.1+ds-1+deb12u1
1.6.4+ds-1
1.7.1+ds-1
1.7.1+ds-2
1.7.2+ds-1
1.8.1+ds-1
1.8.1+ds-2
1.8.2~rc1+ds-1
1.8.2~rc1+ds-2
1.8.2~rc1+ds2-1
1.8.4+ds-1
1.8.4+ds-2
1.8.4+ds-3~bpo12+1~bin
1.8.4+ds-3~bpo12+1
1.8.4+ds-3
1.9.0+ds-1
1.9.0+ds-2
1.9.1+ds-1
1.9.2+ds-1
1.9.2+ds-2
1.9.2+ds-3
1.9.2+ds-4
1.9.2+ds-5
1.9.2+ds-6
1.9.2+ds-7
1.9.2+ds-8
1.9.2+ds-9
1.9.3+ds-1
1.9.4+ds-1
1.9.6+ds-1
1.9.7+ds-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53583.json"

Debian:13 / libgit2

Package

Name
libgit2
Purl
pkg:deb/debian/libgit2?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.9.0+ds-2+deb13u1

Affected versions

1.*
1.9.0+ds-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53583.json"

Debian:14 / libgit2

Package

Name
libgit2
Purl
pkg:deb/debian/libgit2?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.9.6+ds-1

Affected versions

1.*
1.9.0+ds-2
1.9.1+ds-1
1.9.2+ds-1
1.9.2+ds-2
1.9.2+ds-3
1.9.2+ds-4
1.9.2+ds-5
1.9.2+ds-6
1.9.2+ds-7
1.9.2+ds-8
1.9.2+ds-9
1.9.3+ds-1
1.9.4+ds-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53583.json"