{"id":"UBUNTU-CVE-2026-52726","details":"Dulwich is a pure-Python implementation of the Git file formats and protocols. Starting in version 0.23.2 and prior to version 1.2.5, `dulwich.porcelain.submodule_update`, and by extension `porcelain.clone(..., recurse_submodules=True)`, materializes attacker-controlled submodule paths from a crafted upstream repository without path validation. A malicious `.gitmodules` plus a matching tree gitlink whose `path` is `.git/hooks` (or any other directory inside the parent repository's `.git` directory) causes the attacker's submodule tree contents to be written directly into the victim's `.git/hooks/` directory, preserving executable mode bits. The dropped executables are then run by any subsequent `git` or `dulwich` command that invokes the matching hook, resulting in arbitrary code execution. This is the dulwich equivalent of the upstream Git fixes for CVE-2024-32002 / CVE-2024-32004, which were never propagated into dulwich's separately implemented submodule porcelain. Version 1.2.5 patches the issue.","modified":"2026-06-17T04:30:55Z","published":"2026-06-10T23:16:00Z","upstream":["CVE-2026-52726"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-52726"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-52726"},{"type":"REPORT","url":"https://github.com/jelmer/dulwich/releases/tag/dulwich-1.2.5"},{"type":"REPORT","url":"https://github.com/jelmer/dulwich/security/advisories/GHSA-gfhv-vqv2-4544"}],"affected":[{"package":{"name":"dulwich","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/dulwich?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.11.2-1ubuntu1","0.12.0-1","0.12.0-1build1","0.12.0-1build2"],"ecosystem_specific":{"binaries":[{"binary_name":"pypy-dulwich","binary_version":"0.12.0-1build2"},{"binary_version":"0.12.0-1build2","binary_name":"python-dulwich"},{"binary_name":"python3-dulwich","binary_version":"0.12.0-1build2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52726.json"}},{"package":{"name":"dulwich","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/dulwich?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.2-1build1","0.18.5-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.18.5-1","binary_name":"pypy-dulwich"},{"binary_version":"0.18.5-1","binary_name":"python-dulwich"},{"binary_name":"python3-dulwich","binary_version":"0.18.5-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52726.json"}},{"package":{"name":"dulwich","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/dulwich?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.19.11-2","0.19.14-4ubuntu1","0.19.15-1","0.19.15-1build1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.19.15-1build1","binary_name":"pypy-dulwich"},{"binary_version":"0.19.15-1build1","binary_name":"python3-dulwich"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52726.json"}},{"package":{"name":"dulwich","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/dulwich?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.20.15-1ubuntu1","0.20.31-1ubuntu1","0.20.31-1.1","0.20.31-1.1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-dulwich","binary_version":"0.20.31-1.1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52726.json"}},{"package":{"name":"dulwich","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/dulwich?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.21.6-1","0.21.6-1build1","0.21.6-1build2"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-dulwich","binary_version":"0.21.6-1build2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52726.json"}},{"package":{"name":"dulwich","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/dulwich?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.22.7-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.22.7-1","binary_name":"python3-dulwich"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52726.json"}},{"package":{"name":"dulwich","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/dulwich?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.22.7-1","0.24.2-2","1.1.0-2ubuntu1","1.1.0-3"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-dulwich","binary_version":"1.1.0-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-52726.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}