gitoxide before 0.52.1 Repository Boundary Violation via symlinked .gitmodules

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gitoxide before 0.52.1 follows symlinks when reading the worktree .gitmodules file, allowing attackers to inject out-of-repository bytes into submodule metadata. Attackers can create a malicious repository with a symlinked .gitmodules pointing outside the repository tree, causing gitoxide to parse arbitrary external files as submodule configuration and expose attacker-controlled name, path, and url values.

Source published

28 Aug 2026 10:49:36 UTC

Source modified

29 Aug 2026 13:38:27 UTC

Saved here

23 Oct 2026 15:48:27 UTC

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CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS 3.1 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

gitoxide before 0.52.1 follows symlinks when reading the worktree .gitmodules file, allowing attackers to inject out-of-repository bytes into submodule metadata. Attackers can create a malicious repository with a symlinked .gitmodules pointing outside the repository tree, causing gitoxide to parse arbitrary external files as submodule configuration and expose attacker-controlled name, path, and url values.

Source published

Aug 28, 2026, 10:49:36 AM (timezone not stated)

Source modified

Aug 29, 2026, 1:38:27 PM (timezone not stated)

Saved here

15 Nov 2026 17:53:05 UTC

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ENISA EUVD · source terms and attribution apply

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Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 4.0 · 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

gitoxide before 0.52.1 follows symlinks when reading the worktree .gitmodules file, allowing attackers to inject out-of-repository bytes into submodule metadata. Attackers can create a malicious repository with a symlinked .gitmodules pointing outside the repository tree, causing gitoxide to parse arbitrary external files as submodule configuration and expose attacker-controlled name, path, and url values.

Source published

28 Aug 2026 12:16:37 UTC

Source modified

29 Aug 2026 14:16:37 UTC

Saved here

25 Oct 2026 16:19:10 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

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Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · [email protected] · Secondary · 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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

CVSS 3.1 · [email protected] · Secondary · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

## Summary attachments: [pocs.zip](https://github.com/user-attachments/files/26431422/pocs.zip) When `Repository::submodules()` loads submodule metadata, it prefers the worktree `.gitmodules` file if that path exists. In the current implementation, the path is read with `std::fs::read()`, which follows symlinks. As a result, a repository can present a symlinked `.gitmodules` that points outside the repository, and gitoxide will parse the out-of-repository bytes as submodule configuration. This is a repository-boundary violation. A caller using the high-level submodule API can believe it is reading repository-local submodule metadata, while the bytes are actually coming from an arbitrary file outside the repository tree. ## Root cause analysis The relevant flow is: 1. [`gix/src/repository/location.rs`](https://github.com/GitoxideLabs/gitoxide/blob/v0.52.0/gix/src/repository/location.rs) derives the worktree `.gitmodules` path as `workdir/.gitmodules`. 2. [`gix/src/repository/submodule.rs`](https://github.com/GitoxideLabs/gitoxide/blob/v0.52.0/gix/src/repository/submodule.rs) reads that path with `std::fs::read(&path)` and immediately parses the bytes as a submodule configuration file. 3. `Repository::submodules()` exposes the parsed entries through the high-level API. The issue is not in the parser. The issue is that the worktree path is treated as an ordinary file without checking whether it is a symlink, and without checking whether the canonicalized target remains inside the repository worktree. Because `std::fs::read()` follows symlinks, a malicious repository can cause gitoxide to ingest bytes from an attacker-chosen location outside the repository. The resulting `Submodule` objects then expose `name`, `path`, and `url` values derived from that external file. ## Reproduction steps Use the attached PoC zip that contains the `pocs/` workspace. 1. Unzip the PoC archive. 2. Enter `pocs/F001`. 3. Run: ```bash cargo run --quiet ``` 4. Compare the output with `pocs/F001/result.txt`. Important outputs include: - `gitmodules_symlink=.../victim-repo/.gitmodules` - `symlink_target=.../outside/modules.conf` - `parsed_name=symlinked` - `parsed_path=deps/symlinked` - `parsed_url=https://attacker.example/symlinked.git` These outputs show that gitoxide parsed the submodule configuration from the symlink target outside the repository, not from repository-local bytes. ## Impact Confirmed impact: - out-of-repository bytes can be injected into the result of `Repository::submodules()`; - callers can be misled about submodule metadata such as `name`, `path`, and `url`; - any downstream workflow that uses those values to decide clone, fetch, update, or policy behavior is operating on attacker-controlled data that did not actually originate from the repository tree. This report does **not** claim direct command execution from this code path by itself. The demonstrated impact is metadata injection across the repository boundary. ## Recommended fix A safe fix is to stop silently following symlinks for the worktree `.gitmodules` path in this loading path. Reasonable options include: 1. use `symlink_metadata()` / `lstat`style checks and reject symlinked `.gitmodules` when loading from the worktree; 2. canonicalize the target and verify that it still resides under the repository worktree before reading it; 3. for security-sensitive callers, prefer loading `.gitmodules` from the index or `HEAD` tree rather than following the worktree path. At minimum, the worktree path should not silently follow symlinks to arbitrary external files.

Source published

5 May 2026 19:26:09 UTC

Source modified

10 Sep 2026 03:51:06 UTC

Saved here

24 Oct 2026 13:19:54 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P

Publisher rating · HIGH