DEBIAN-CVE-2026-53586

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Source
https://security-tracker.debian.org/tracker/CVE-2026-53586
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53586.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-53586
Upstream
Published
2026-08-20T19:16:54Z
Modified
2026-09-10T08:47:33Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/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, the built-in HTTP transport in src/libgit2/transports/http.c follows an offsite initial redirect, and handle_remote_auth and handle_auth pass transport->owner->url instead of transport->server.url to the credential callback when the redirected host returns 401 Unauthorized. A callback that scopes credentials to the original trusted URL can therefore return GIT_CREDENTIAL_USERPASS_PLAINTEXT credentials that libgit2 stores in transport->server.cred and sends as an Authorization header to the redirected host. An attacker who controls a trusted Git host or an open redirect on that host can disclose HTTP Basic credentials, personal access tokens, or equivalent credentials. 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-2026-53586.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-2026-53586.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-2026-53586.json"