DEBIAN-CVE-2026-42563
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's `ProcessMergeDriver` substitutes the file path (from the git tree, controllable by an attacker via a malicious branch) into the merge driver command via the `%P` placeholder and executes it with `subprocess.run(..., shell=True)`. An attacker who can cause a victim to merge an untrusted branch can achieve arbitrary command execution by crafting malicious file paths. Version 1.2.5 fixes the issue.
DEBIAN-CVE-2026-42563
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-42563
dulwich
Source reference: /affected/0/package/name
- Affected versions
- 0.21.2-1
Source reference:
/affected/0/versions0.21.5-1Source reference:
/affected/0/versions0.21.6-1Source reference:
/affected/0/versions0.22.5-1Source reference:
/affected/0/versions0.22.7-1Source reference:
/affected/0/versions0.22.7-2Source reference:
/affected/0/versions0.24.10-1Source reference:
/affected/0/versions0.24.2-1Source reference:
/affected/0/versions0.24.2-2Source reference:
/affected/0/versions1.0.0-1Source reference:
/affected/0/versions1.0.0-2Source reference:
/affected/0/versions1.1.0-1Source reference:
/affected/0/versions1.1.0-2Source reference:
/affected/0/versions1.1.0-3Source reference:
/affected/0/versions1.2.0-1Source reference:
/affected/0/versions1.2.1-1Source reference:
/affected/0/versions1.2.11-1Source reference:
/affected/0/versions1.2.12-1Source reference:
/affected/0/versions1.2.5-1Source reference:
/affected/0/versions1.2.7-1Source reference:
/affected/0/versions1.2.7-2Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
dulwich
Source reference: /affected/1/package/name
- Affected versions
- 0.22.7-1
Source reference:
/affected/1/versions0.22.7-2Source reference:
/affected/1/versions0.24.10-1Source reference:
/affected/1/versions0.24.2-1Source reference:
/affected/1/versions0.24.2-2Source reference:
/affected/1/versions1.0.0-1Source reference:
/affected/1/versions1.0.0-2Source reference:
/affected/1/versions1.1.0-1Source reference:
/affected/1/versions1.1.0-2Source reference:
/affected/1/versions1.1.0-3Source reference:
/affected/1/versions1.2.0-1Source reference:
/affected/1/versions1.2.1-1Source reference:
/affected/1/versions1.2.11-1Source reference:
/affected/1/versions1.2.12-1Source reference:
/affected/1/versions1.2.5-1Source reference:
/affected/1/versions1.2.7-1Source reference:
/affected/1/versions1.2.7-2Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
dulwich
Source reference: /affected/2/package/name
- Affected versions
- 0.22.7-1
Source reference:
/affected/2/versions0.22.7-2Source reference:
/affected/2/versions0.24.10-1Source reference:
/affected/2/versions0.24.2-1Source reference:
/affected/2/versions0.24.2-2Source reference:
/affected/2/versions1.0.0-1Source reference:
/affected/2/versions1.0.0-2Source reference:
/affected/2/versions1.1.0-1Source reference:
/affected/2/versions1.1.0-2Source reference:
/affected/2/versions1.1.0-3Source reference:
/affected/2/versions1.2.0-1Source reference:
/affected/2/versions1.2.1-1Source reference:
/affected/2/versions - Fixed versions
- 1.2.5-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dulwich",
"purl": "pkg:deb/debian/dulwich?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"0.21.2-1",
"0.21.5-1",
"0.21.6-1",
"0.22.5-1",
"0.22.7-1",
"0.22.7-2",
"0.24.10-1",
"0.24.2-1",
"0.24.2-2",
"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",
"1.2.11-1",
"1.2.12-1",
"1.2.5-1",
"1.2.7-1",
"1.2.7-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42563.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "dulwich",
"purl": "pkg:deb/debian/dulwich?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"0.22.7-1",
"0.22.7-2",
"0.24.10-1",
"0.24.2-1",
"0.24.2-2",
"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",
"1.2.11-1",
"1.2.12-1",
"1.2.5-1",
"1.2.7-1",
"1.2.7-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42563.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.5-1"
}
]
}
],
"package": {
"name": "dulwich",
"purl": "pkg:deb/debian/dulwich?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"0.22.7-1",
"0.22.7-2",
"0.24.10-1",
"0.24.2-1",
"0.24.2-2",
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42563.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57001 · Revision 1
- Added to Heist Feed
- Publisher date