{"id":"CVE-2026-114096","aliases":["CLSA-2026-1791266024","DEBIAN-CVE-2026-114096","EUVD-2026-106899","GHSA-35mr-4567-66vg","GHSA-5fqc-mrg8-w798","GHSA-8w8g-wq8h-fq33","GHSA-8wh8-hpg9-jvx8","GHSA-cm62-gvxx-vmxx","MGASA-2026-0589","UBUNTU-CVE-2026-114096"],"status":"published","title":"Dulwich 0.24.0 before 1.2.8 Symlink Write-Through via porcelain.checkout paths","description":"Dulwich from 0.24.0 before 1.2.8 contains a symlink following vulnerability in porcelain.checkout(paths=[...]) that allows attackers to write arbitrary files by abusing raw os.open without O_NOFOLLOW. Attackers can craft a repository where a worktree symlink points to .git/hooks/post-checkout, so restoring the file from a tag writes a malicious hook for code execution.","severity":{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00155,"percentile":0.04675,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-59","CWE-61"],"published":"2026-10-02T18:53:35Z","modified":"2026-11-10T16:58:15Z","fixes":[{"ecosystem":"PyPI","package":"dulwich","fixed_in":["1.2.8"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:14","package":"dulwich","fixed_in":["1.2.8-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"dulwich","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.24.0"},{"last_affected":"1.2.7"},{"fixed":"1.2.8"}]}]},{"source":"osv","ecosystem":"TuxCare:PyPI","package":"dulwich","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.25.2"},{"fixed":"0.25.2.post7+tuxcare"}]}],"versions":["0.25.2","0.25.2.post1+tuxcare","0.25.2.post2+tuxcare","0.25.2.post3+tuxcare","0.25.2.post4+tuxcare","0.25.2.post5+tuxcare","0.25.2.post6+tuxcare"],"bundled":4},{"source":"osv","ecosystem":"Debian:12","package":"dulwich","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","1.2.17-1","1.2.5-1","1.2.7-1","1.2.7-2"]},{"source":"osv","ecosystem":"Debian:13","package":"dulwich","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","1.2.17-1","1.2.5-1","1.2.7-1","1.2.7-2"]},{"source":"osv","ecosystem":"Debian:14","package":"dulwich","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.8-1"}]}],"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","1.2.5-1","1.2.7-1","1.2.7-2"]},{"source":"osv","ecosystem":"PyPI","package":"dulwich","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.24.0"},{"fixed":"1.2.8"}]}],"versions":["0.24.0","0.24.1","0.24.10","0.24.2","0.24.3","0.24.4","0.24.5","0.24.6","0.24.7","0.24.8","0.24.9","0.25.0","0.25.1","0.25.2","1.0.0","1.1.0","1.2.0","1.2.1","1.2.2","1.2.3","1.2.4","1.2.5","1.2.6","1.2.7"]},{"source":"osv","ecosystem":"Mageia:10","package":"python-dulwich","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.21-1.1.mga10"}]}],"bundled":7},{"source":"osv","ecosystem":"Mageia:10","package":"rust-similar3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.1-1.mga10"}]}],"bundled":7},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"dulwich","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.11.2-1ubuntu1","0.12.0-1","0.12.0-1build1","0.12.0-1build2"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"dulwich","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.2-1build1","0.18.5-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"dulwich","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.19.11-2","0.19.14-4ubuntu1","0.19.15-1","0.19.15-1build1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"dulwich","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"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"dulwich","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.21.6-1","0.21.6-1build1","0.21.6-1build2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"dulwich","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.22.7-1","0.24.2-2","1.1.0-2ubuntu1","1.1.0-3"]}],"products":[{"vendor":"jelmer","product":"dulwich"}],"references":[{"url":"https://github.com/jelmer/dulwich/security/advisories/GHSA-8w8g-wq8h-fq33","tags":["vendor-advisory","exploit","advisory","web","report"]},{"url":"https://www.vulncheck.com/advisories/dulwich-0.24.0-before-1.2.8-symlink-write-through-via-porcelain-checkout-paths","tags":["third-party-advisory","advisory"]},{"url":"https://github.com/jelmer/dulwich/commit/9389fcb5cb9113adfc7f207d8be86a56904db3e8","tags":["web"]},{"url":"https://github.com/jelmer/dulwich/releases/tag/dulwich-1.2.8","tags":["web"]},{"url":"https://github.com/advisories/GHSA-8w8g-wq8h-fq33"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114096","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-8wh8-hpg9-jvx8"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114096.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-114096","tags":["advisory"]},{"url":"https://github.com/jelmer/dulwich","tags":["package"]},{"url":"https://advisories.mageia.org/MGASA-2026-0589.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=35907","tags":["report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YORLARHG3RTPSDHI7QFLTZNL67NVZCN7/","tags":["web"]},{"url":"https://github.com/jelmer/dulwich/security/advisories/GHSA-555p-6grf-mh7f","tags":["advisory"]},{"url":"https://github.com/jelmer/dulwich/security/advisories/GHSA-xrvj-v92f-53gj","tags":["advisory"]},{"url":"https://github.com/jelmer/dulwich/security/advisories/GHSA-cm62-gvxx-vmxx","tags":["advisory"]},{"url":"https://github.com/jelmer/dulwich/security/advisories/GHSA-5fqc-mrg8-w798","tags":["advisory"]},{"url":"https://github.com/jelmer/dulwich/security/advisories/GHSA-35mr-4567-66vg","tags":["advisory"]},{"url":"https://github.com/jelmer/dulwich/security/advisories/GHSA-8mcx-5rqc-vhmf","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-114096","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-114096","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-114096","title":"Dulwich 0.24.0 before 1.2.8 Symlink Write-Through via porcelain.checkout paths","description":"Dulwich from 0.24.0 before 1.2.8 contains a symlink following vulnerability in porcelain.checkout(paths=[...]) that allows attackers to write arbitrary files by abusing raw os.open without O_NOFOLLOW. Attackers can craft a repository where a worktree symlink points to .git/hooks/post-checkout, so restoring the file from a tag writes a malicious hook for code execution.","status":"published","published":"2026-10-21T00:36:59.763Z","modified":"2026-10-28T13:46:53.993Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-59"],"updated_at":"2026-11-02T13:40:01.309549Z"}],"euvd":[{"id":"EUVD-2026-106899","description":"Dulwich from 0.24.0 before 1.2.8 contains a symlink following vulnerability in porcelain.checkout(paths=[...]) that allows attackers to write arbitrary files by abusing raw os.open without O_NOFOLLOW. Attackers can craft a repository where a worktree symlink points to .git/hooks/post-checkout, so restoring the file from a tag writes a malicious hook for code execution.","status":"published","published":"2026-10-21T00:36:59Z","modified":"2026-10-28T13:46:53Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:59:21.177264Z"}],"ghsa":[{"id":"GHSA-8w8g-wq8h-fq33","title":"Dulwich: Symlink write-through in checkout(paths=[]) via raw os.open bypasses all symlink protections","description":"## Summary\n\nDulwich's `porcelain.checkout(paths=[...])` code path writes files using raw `os.open(file_path, O_WRONLY|O_CREAT|O_TRUNC, mode)` followed by `f.write(obj.data)`. This code path does NOT call `build_file_from_blob()` at all, completely bypassing any symlink protections (including the unreleased d09f8af fix). `os.open` without `O_NOFOLLOW` follows symlinks at both the target file and intermediate directories, allowing arbitrary file writes.\n\n## Root Cause\n\nAt `dulwich/porcelain/__init__.py:5661-5675`, the `checkout(paths=[...])` implementation:\n\n```python\nfile_path = _checked_worktree_path(r, path)\nos.makedirs(os.path.dirname(file_path), exist_ok=True)\nflags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC\nwith os.fdopen(os.open(file_path, flags, mode), \"wb\") as f:\n    f.write(obj.data)\n```\n\n`_checked_worktree_path()` (line 601-631) only performs name validation — checking that the path doesn't start with `/` or `\\\\` and that components pass `INVALID_DOTNAMES` checks. It performs zero filesystem symlink detection.\n\n## Impact\n\nAn attacker can craft a malicious repository that, when a victim clones it and runs `checkout(paths=[...])`, writes attacker-controlled content (with attacker-controlled permissions) to any filesystem location accessible to the user. Writing to `.git/hooks/post-checkout` achieves RCE on the next git checkout.\n\n## Attack Scenario\n\n1. Attacker creates a repository where HEAD has `trigger` as a symlink (mode 120000, content `../../.git/hooks/post-checkout`), and tag `v1.0` has `trigger` as an executable file (mode 100755, content `#!/bin/sh\\nmalicious_payload`)\n2. Victim clones the repository — worktree has `trigger` → `../../.git/hooks/post-checkout` (a symlink)\n3. Victim runs `porcelain.checkout(repo, target=\"v1.0\", paths=[\"trigger\"])` to restore a specific file from a tag\n4. `_checked_worktree_path(r, \"trigger\")` passes — name validation only, no symlink check\n5. `os.open(\"trigger\", O_WRONLY|O_CREAT|O_TRUNC, 0o755)` follows the symlink → opens `.git/hooks/post-checkout` for writing\n6. `f.write(obj.data)` writes the malicious payload to the hook\n7. Next checkout operation triggers the hook → RCE\n\n## Suggested Fix\n\nReplace the raw `os.open` path with a call to `build_file_from_blob` (once that function is hardened against intermediate symlinks), or add explicit symlink detection: resolve the path with `os.path.realpath()` and verify it stays within the worktree root before opening.\n\nReported by **zx (Jace)**","status":"published","published":"2026-10-02T18:53:35Z","modified":"2026-10-02T18:53:36Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-59","CWE-61"],"updated_at":"2026-11-02T14:41:24.739884Z"},{"id":"GHSA-8wh8-hpg9-jvx8","title":"Dulwich from 0.24.0 before 1.2.8 contains a symlink following vulnerability in porcelain.checkout...","description":"Dulwich from 0.24.0 before 1.2.8 contains a symlink following vulnerability in porcelain.checkout(paths=[...]) that allows attackers to write arbitrary files by abusing raw os.open without O_NOFOLLOW. Attackers can craft a repository where a worktree symlink points to .git/hooks/post-checkout, so restoring the file from a tag writes a malicious hook for code execution.","status":"published","published":"2026-10-21T03:32:26Z","modified":"2026-10-21T03:32:26Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-59"],"updated_at":"2026-11-02T15:14:08.480034Z"}],"nvd":[{"id":"CVE-2026-114096","description":"Dulwich from 0.24.0 before 1.2.8 contains a symlink following vulnerability in porcelain.checkout(paths=[...]) that allows attackers to write arbitrary files by abusing raw os.open without O_NOFOLLOW. Attackers can craft a repository where a worktree symlink points to .git/hooks/post-checkout, so restoring the file from a tag writes a malicious hook for code execution.","status":"published","published":"2026-10-21T01:17:34.933Z","modified":"2026-10-28T14:16:57.093Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-59"],"updated_at":"2026-11-02T14:13:02.045979Z"}],"osv":[{"id":"CVE-2026-114096","title":"Dulwich 0.24.0 before 1.2.8 Symlink Write-Through via porcelain.checkout paths","description":"Dulwich from 0.24.0 before 1.2.8 contains a symlink following vulnerability in porcelain.checkout(paths=[...]) that allows attackers to write arbitrary files by abusing raw os.open without O_NOFOLLOW. Attackers can craft a repository where a worktree symlink points to .git/hooks/post-checkout, so restoring the file from a tag writes a malicious hook for code execution.","status":"published","published":"2026-10-21T00:36:59.763Z","modified":"2026-10-30T02:30:55.460621644Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-59"],"updated_at":"2026-11-02T15:44:56.310988Z"},{"id":"DEBIAN-CVE-2026-114096","description":"Dulwich from 0.24.0 before 1.2.8 contains a symlink following vulnerability in porcelain.checkout(paths=[...]) that allows attackers to write arbitrary files by abusing raw os.open without O_NOFOLLOW. Attackers can craft a repository where a worktree symlink points to .git/hooks/post-checkout, so restoring the file from a tag writes a malicious hook for code execution.","status":"published","published":"2026-10-21T01:17:34.933Z","modified":"2026-10-29T10:00:17.877219749Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"updated_at":"2026-11-02T15:45:50.923612Z"},{"id":"GHSA-8w8g-wq8h-fq33","title":"Dulwich: Symlink write-through in checkout(paths=[]) via raw os.open bypasses all symlink protections","description":"## Summary\n\nDulwich's `porcelain.checkout(paths=[...])` code path writes files using raw `os.open(file_path, O_WRONLY|O_CREAT|O_TRUNC, mode)` followed by `f.write(obj.data)`. This code path does NOT call `build_file_from_blob()` at all, completely bypassing any symlink protections (including the unreleased d09f8af fix). `os.open` without `O_NOFOLLOW` follows symlinks at both the target file and intermediate directories, allowing arbitrary file writes.\n\n## Root Cause\n\nAt `dulwich/porcelain/__init__.py:5661-5675`, the `checkout(paths=[...])` implementation:\n\n```python\nfile_path = _checked_worktree_path(r, path)\nos.makedirs(os.path.dirname(file_path), exist_ok=True)\nflags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC\nwith os.fdopen(os.open(file_path, flags, mode), \"wb\") as f:\n    f.write(obj.data)\n```\n\n`_checked_worktree_path()` (line 601-631) only performs name validation — checking that the path doesn't start with `/` or `\\\\` and that components pass `INVALID_DOTNAMES` checks. It performs zero filesystem symlink detection.\n\n## Impact\n\nAn attacker can craft a malicious repository that, when a victim clones it and runs `checkout(paths=[...])`, writes attacker-controlled content (with attacker-controlled permissions) to any filesystem location accessible to the user. Writing to `.git/hooks/post-checkout` achieves RCE on the next git checkout.\n\n## Attack Scenario\n\n1. Attacker creates a repository where HEAD has `trigger` as a symlink (mode 120000, content `../../.git/hooks/post-checkout`), and tag `v1.0` has `trigger` as an executable file (mode 100755, content `#!/bin/sh\\nmalicious_payload`)\n2. Victim clones the repository — worktree has `trigger` → `../../.git/hooks/post-checkout` (a symlink)\n3. Victim runs `porcelain.checkout(repo, target=\"v1.0\", paths=[\"trigger\"])` to restore a specific file from a tag\n4. `_checked_worktree_path(r, \"trigger\")` passes — name validation only, no symlink check\n5. `os.open(\"trigger\", O_WRONLY|O_CREAT|O_TRUNC, 0o755)` follows the symlink → opens `.git/hooks/post-checkout` for writing\n6. `f.write(obj.data)` writes the malicious payload to the hook\n7. Next checkout operation triggers the hook → RCE\n\n## Suggested Fix\n\nReplace the raw `os.open` path with a call to `build_file_from_blob` (once that function is hardened against intermediate symlinks), or add explicit symlink detection: resolve the path with `os.path.realpath()` and verify it stays within the worktree root before opening.\n\nReported by **zx (Jace)**","status":"published","published":"2026-10-02T18:53:35Z","modified":"2026-10-21T10:57:28.880982828Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-59","CWE-61"],"updated_at":"2026-11-02T15:46:42.78452Z"},{"id":"UBUNTU-CVE-2026-114096","description":"Dulwich from 0.24.0 before 1.2.8 contains a symlink following vulnerability in porcelain.checkout(paths=[...]) that allows attackers to write arbitrary files by abusing raw os.open without O_NOFOLLOW. Attackers can craft a repository where a worktree symlink points to .git/hooks/post-checkout, so restoring the file from a tag writes a malicious hook for code execution.","status":"published","published":"2026-10-21T01:17:00Z","modified":"2026-10-28T20:17:45.304747607Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"},{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:55:59.591851Z"},{"id":"CLSA-2026-1791266024","title":"TuxCare security update for dulwich (8 CVEs)","description":"TuxCare rebuilt dulwich to address 8 CVEs. Fixed in 0.25.2.post7+tuxcare.","status":"published","published":"2026-10-06T05:53:44Z","modified":"2026-10-27T13:43:11.943518922Z","updated_at":"2026-11-02T15:43:49.016976Z"},{"id":"MGASA-2026-0589","title":"Updated python-dulwich \u0026 rust-similar3 packages fixes security vulnerabilities","description":"Commit subjects not sanitized in ``porcelain.format_patch``\nUnbounded memory allocation in receive-pack from crafted thin packs\nDulwich from 0.22.5 before 1.2.8 contains a path traversal vulnerability\nin stash.py pop() that allows attackers to write arbitrary files outside\nthe worktree through intermediate directory symlinks. Attackers can\ncraft a malicious repository whose popped stash writes a payload into\n.git/hooks/post-checkout, achieving code execution on the next checkout.\nDulwich from 0.23.1 before 1.2.8 contains a path traversal vulnerability\nin CommitFilter._apply_index_filter() that allows attackers to write\nfiles outside the working directory via symlinks persisting between\ncommits. Attackers can craft a repository where an ancestor commit's\nsymlink redirects a descendant commit's file writes during\nfilter_branch, enabling code execution by writing into .git/hooks.\nDulwich before 1.2.9 contains a denial of service vulnerability in\nPack.resolve_object that allows attackers to cause infinite recursion\nvia self-referential OFS_DELTA objects. Attackers can supply a malicious\npackfile with an OFS_DELTA delta_offset of 0 to exhaust CPU during\nclone, fetch, or cat-file operations.\nDulwich before 1.2.9 fails to validate DOS drive letter prefixes in Git\ntree path elements on Windows, allowing arbitrary file write. Attackers\ncan craft a malicious repository with a tree entry named 'C:' that\nbypasses NTFS validation and writes files outside the worktree to\nachieve remote code execution.\nDulwich from 0.24.0 before 1.2.8 contains a symlink following\nvulnerability in porcelain.checkout(paths=[...]) that allows attackers\nto write arbitrary files by abusing raw os.open without O_NOFOLLOW.\nAttackers can craft a repository where a worktree symlink points to\n.git/hooks/post-checkout, so restoring the file from a tag writes a\nmalicious hook for code execution.\n","status":"published","published":"2026-11-10T16:31:41Z","modified":"2026-11-10T16:58:15.079951964Z","updated_at":"2026-11-10T17:04:13.670671Z"}]}}