Security context

What an agent needs to avoid regressing past fixes and find the next vuln in this repo.

psf/black

              main @ bf83d5f
            

Fixes

CVEs

CRITICAL

Peak severity

87.5%

Coverage

Highlights

Denial of Service: 6 prior fixes. Scrutinize any change in this area.

GitHub: most-fixed (2 issues). Treat as high-risk during review.

4 high-severity fixes in this history; regressions here are high-impact.

Recurring patterns

The bug types that recur here, drawn from past fixes, not open vulnerabilities.

Remote Code Execution: Insecure parsing of user-controlled version inputs (such as dependency references from a pull request) allows attackers to execute arbitrary code within the GitHub Actions runner context. This is also tracked as CVE-2026-31900.

Denial of Service: Quadratic-time scanning behavior in TokenProxy lookahead during parsing allows maliciously crafted Python files with dense keywords or structures to consume excessive CPU, causing a Denial of Service.

Path Traversal: Unsanitized input from cell magic names directly influences the local cache path generation, leading to an unrestricted arbitrary file write on the system. This is tracked as CVE-2026-32274.