DEBIAN-CVE-2026-47712

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Source
https://security-tracker.debian.org/tracker/CVE-2026-47712
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47712.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-47712
Upstream
Published
2026-06-10T23:16:48Z
Modified
2026-09-14T17:03:41Z
Severity
  • 3.3 (Low) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N CVSS Calculator
Summary
[none]
Details

Dulwich is a pure-Python implementation of the Git file formats and protocols. Starting in version 0.24.0 and prior to version 1.2.5, dulwich.porcelain.format_patch(outdir=...) derives each patch filename from the commit's subject line. Prior to this fix, get_summary only replaced spaces with dashes - path separators (/, ), parent-directory components (..), and other filename-hostile characters (e.g. :) were preserved verbatim and passed straight into os.path.join(outdir, f"{i:04d}-{summary}.patch"). A malicious commit subject could therefore direct the generated patch file outside the requested outdir. This is fixed in Dulwich 1.2.5. Users should upgrade to 1.2.5 or later. dulwich.patch.get_summary now mirrors git's format_sanitized_subject: only [A-Za-z0-9._] are kept, runs of other characters collapse to a single -, consecutive . collapse to a single ., trailing ./- are stripped, and the result is length-limited. This makes the returned string safe to embed as a filename component, so format_patch can no longer be steered out of outdir via the commit subject. Until upgrading, callers that pass untrusted commits to porcelain.format_patch can use stdout=True and write the patch to a destination they control, rather than letting format_patch choose the filename; validate the chosen path before opening - e.g. compare os.path.realpath(returned_path) against os.path.realpath(outdir) and reject any patch whose resolved path is not inside outdir; and/or pre-screen commits and refuse to format any whose subject's first line contains /, , .., or other characters that are not safe on the target filesystem.

References

Affected packages

Debian:12 / dulwich

Package

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

Affected ranges

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

Affected versions

0.*
0.21.2-1
0.21.5-1
0.21.6-1
0.22.5-1
0.22.7-1
0.22.7-2
0.24.2-1
0.24.2-2
0.24.10-1
1.*
1.0.0-1
1.0.0-2
1.1.0-1
1.1.0-2
1.1.0-3
1.2.0-1
1.2.1-1
1.2.5-1
1.2.7-1
1.2.7-2
1.2.11-1
1.2.12-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47712.json"

Debian:13 / dulwich

Package

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

Affected ranges

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

Affected versions

0.*
0.22.7-1
0.22.7-2
0.24.2-1
0.24.2-2
0.24.10-1
1.*
1.0.0-1
1.0.0-2
1.1.0-1
1.1.0-2
1.1.0-3
1.2.0-1
1.2.1-1
1.2.5-1
1.2.7-1
1.2.7-2
1.2.11-1
1.2.12-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47712.json"

Debian:14 / dulwich

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.2.5-1

Affected versions

0.*
0.22.7-1
0.22.7-2
0.24.2-1
0.24.2-2
0.24.10-1
1.*
1.0.0-1
1.0.0-2
1.1.0-1
1.1.0-2
1.1.0-3
1.2.0-1
1.2.1-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47712.json"