DEBIAN-CVE-2026-53587

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Source
https://security-tracker.debian.org/tracker/CVE-2026-53587
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53587.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-53587
Upstream
Published
2026-08-20T19:16:55Z
Modified
2026-09-10T08:47:22Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 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, libgit2 performs a fixed-size strncmp in set_data in src/libgit2/transports/smart_pkt.c without first verifying that the smart-protocol pkt-line capability buffer contains 14 bytes. A malicious Git server can make bytes after the pkt-line complete object-format=, causing format_str to advance beyond the pkt-line and the following memchr length calculation to underflow. The resulting heap out-of-bounds walk can crash a client during the first refs-advertisement packet over HTTP, HTTPS, SSH, or the Git protocol. 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/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53587.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/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53587.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/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53587.json"