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bdu:2026-15419

BREW-aider-CVE-2026-73621 — GitPython: Arbitrary file truncation via git rev-list --output argument injection in unguarded Commit.count

Affected: Homebrew: aider

## Summary `Commit.count()` forwards `**kwargs` into `rev_list` with **no** `check_unsafe_options` guard (the guard exists only in the sibling `iter_items`, commit.py:341). `git rev-list --output=<path>` opens and truncates the target file to 0 bytes before revision parsing, so `count(output='/victim')` destroys/blanks an arbitrary file.

## Root Cause `commit.py:290-291` calls `self.repo.git.rev_list(self.hexsha, **kwargs)` with no `check_unsafe_options` and no `allow_unsafe_options` parameter. The sibling `iter_items` (commit.py:341) is guarded; `count` is not. This is a distinct, uncovered sink — GHSA-956x-8gvw-wg5v fixed `iter_commits`/`blame`, not `count`.

## Impact Destroy/blank an arbitrary file at process privilege (integrity/availability). Reachability is key-control only (`count` uses `self.hexsha`, not a user ref), and the write is a 0-byte truncation (no content control), so MEDIUM.

## Proof of Concept ```python commit.count(output='/path/to/victim') # victim truncated to 0 bytes (verified) # control: commit.iter_commits(output=...) raises UnsafeOptionError ```

## Attack Chain 1. Entry: app forwards user options -> `commit.count(output='/victim')`. Guard: none. Bypass proof: `iter_commits(output=)` raises UnsafeOptionError; `count(output=)` does not — verified side-by-side. 2. Sink: `git rev-list <sha> --output=/victim` -> file truncated to 0 bytes. Impact: destroy/blank arbitrary file.

## Bypass Evidence Live-verified on HEAD (tag 3.1.53): `count(output=<v…

EUVD-2026-352846

fkie_cve-2026-73621

GitPython before 3.1.56 contains an argument injection vulnerability in the Commit.count() method, which forwards keyword arguments to 'git rev-list' without the check_unsafe_options guard present in the sibling iter_items method. An attacker who can control options passed to Commit.count (e.g., via an application that forwards a user-supplied options dict) can supply output=<path>, causing 'git rev-list --output=<path>' to open and truncate the target file to zero bytes before revision parsing. This allows destruction/blanking of an arbitrary file at the process's privilege level (no content control, 0-byte truncation).

GHSA-h75v-4jxv-ppxm

OESA-2026-3699 — python-GitPython security update

Affected: openEuler:24.03-LTS-SP1: python-GitPython

GitPython is a python library used to interact with git repositories, high-level like git-porcelain, or low-level like git-plumbing. Security Fix(es):

GitPython before 3.1.57 contains an incomplete denylist in the unsafe_git_archive_options guard that omits --add-file and --add-virtual-file options. Attackers can supply these options to Repo.archive() to read arbitrary files from the filesystem and include them in the returned archive.(CVE-2026-73619)

GitPython before 3.1.57 fails to guard git option forwarding in IndexFile.checkout() and TagReference.create(), allowing attackers to pass unsafe options via kwargs. Attackers can use --prefix to overwrite arbitrary files with repository content or -F to read arbitrary files returned in-band.(CVE-2026-73620)

GitPython before 3.1.55 fails to disable env…

openSUSE-SU-2026:11566-1 — python313-GitPython-3.1.59-2.1 on GA media

python313-GitPython-3.1.59-2.1 on GA media

PYSEC-2026-3950

Affected: PyPI: gitpython

UBUNTU-CVE-2026-73621

Affected: Ubuntu:Pro:14.04:LTS: python-git, Ubuntu:Pro:16.04:LTS: python-git, Ubuntu:Pro:18.04:LTS: python-git, Ubuntu:Pro:20.04:LTS: python-git, Ubuntu:Pro:22.04:LTS: python-git, Ubuntu:Pro:24.04:LTS: python-git, Ubuntu:Pro:26.04:LTS: python-git