{"schema_version":"1.9.0","id":"RUSTSEC-2026-0257","published":"2026-07-29T12:00:00Z","modified":"2026-10-12T18:00:10.938749232Z","aliases":["GHSA-2ph8-5cr8-hr33"],"summary":"Unix `BROWSER` handling allows browser argument injection","details":"On 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).","affected":[{"package":{"name":"webbrowser","ecosystem":"crates.io","purl":"pkg:cargo/webbrowser"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.0.0-0"},{"fixed":"1.2.2"}]}],"ecosystem_specific":{"affected_functions":null,"affects":{"arch":[],"functions":["webbrowser::open","webbrowser::open_browser","webbrowser::open_browser_with_options"],"os":[]}},"database_specific":{"categories":["format-injection"],"cvss":null,"informational":null,"source":"https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0257.json"}}],"references":[{"type":"PACKAGE","url":"https://crates.io/crates/webbrowser"},{"type":"ADVISORY","url":"https://rustsec.org/advisories/RUSTSEC-2026-0257.html"},{"type":"WEB","url":"https://github.com/amodm/webbrowser-rs/commit/31d1b924885551c0e553909d27c738ca6958a0f3"},{"type":"WEB","url":"https://github.com/amodm/webbrowser-rs/commit/31d1b924885551c0e553909d27c738ca6958a0f3"},{"type":"WEB","url":"https://github.com/amodm/webbrowser-rs/releases/tag/v1.2.2"}],"database_specific":{"license":"CC0-1.0"}}