Security context

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

psf/requests

              main @ d64b9ad
            

Fixes

CVEs

CRITICAL

Peak severity

Highlights

Information Disclosure: 9 prior fixes. Scrutinize any change in this area.

requests/sessions.py: most-fixed (16 issues). Treat as high-risk during review.

3 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.

Information Disclosure: The library has repeatedly leaked sensitive headers (Authorization, Cookie, Proxy-Authorization) and request bodies across cross-origin, cross-scheme, or cross-port boundaries during HTTP redirects. Developers modifying the redirect pipeline must ensure rigorous state stripping.

Cryptographic Issues: TLS certificate validation has been silently bypassed due to simple string-matching flaws (such as missing .lower() calls on scheme strings) and improper environment-variable fallback logic. Ensure case-insensitive scheme matching is consistently enforced prior to evaluating verification requirements.