Dulwich: Symlink directory traversal in filter-branch index_filter via cross-commit state persistence

Summary Dulwich's filterbranch.py CommitFilter.applyindexfilter is vulnerable to symlink directory traversal. When processing commit history, materialized tree entries including symlinks persist in the working directory between commits, allowing a symlink from an ancestor commit to redirect file...

CrossCommitVuln-Bench: A Dataset of Multi-Commit Python Vulnerabilities Invisible to Per-Commit Static Analysis

We present CrossCommitVuln-Bench, a curated benchmark of 15 real-world Python vulnerabilities CVEs in which the exploitable condition was introduced across multiple commits - each individually benign to per-commit static analysis - but collectively critical. We manually annotate each CVE with its...