{"id":"RUSTSEC-2026-0257","aliases":["GHSA-2ph8-5cr8-hr33"],"title":"Unix `BROWSER` handling allows browser argument injection","summary":"Unix `BROWSER` handling allows browser argument injection","severity":"none","vendor":"webbrowser","product":"webbrowser","ecosystem":"rust","affected":["webbrowser >= 0.0.0-0, < 1.2.2"],"patched":["webbrowser 1.2.2"],"published":"2026-07-29","updated":"2026-08-12","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/RUSTSEC-2026-0257","references":[{"url":"https://crates.io/crates/webbrowser"},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0257.html"},{"url":"https://github.com/amodm/webbrowser-rs/security/advisories/GHSA-2ph8-5cr8-hr33"},{"url":"https://github.com/amodm/webbrowser-rs/commit/31d1b924885551c0e553909d27c738ca6958a0f3"},{"url":"https://github.com/amodm/webbrowser-rs/releases/tag/v1.2.2"}],"tags":["osv","rust"],"ingestedAt":"2026-08-12T19:18:09.039Z","slug":"RUSTSEC-2026-0257","body":"## Overview\n\nOn Unix platforms handled by `src/unix.rs`, affected versions substitute the\ncaller-supplied URL into the `BROWSER` environment-variable template before\ntokenizing the resulting string with `split_ascii_whitespace()`. If an\napplication passes an attacker-controlled non-HTTP(S) URL whose parsed form\nretains spaces and the effective `BROWSER` template contains `%s`, text that\nshould remain within one URL argument becomes additional browser arguments.\n\nThe issue was reproduced with Chromium by injecting\n`--remote-debugging-port`, which exposed a local DevTools endpoint, and\n`--proxy-server`, which redirected browser traffic through an\nattacker-controlled proxy. The available arguments and resulting impact depend\non the browser launched by the affected application.\n\nVersion 1.2.2 fixes the issue by tokenizing the `BROWSER` template before\nsubstituting the URL, preserving the URL as part of a single argument. Users\nshould upgrade to version 1.2.2 or later. Applications that only need HTTP(S)\nURLs can also enable the crate's `hardened` feature as defense in depth.\n\nThis issue was reported by\n[@dywzju09-blip](https://github.com/dywzju09-blip).\n\n## Affected packages\n\n- `webbrowser >= 0.0.0-0, < 1.2.2`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `webbrowser 1.2.2`","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}