{"id":"GHSA-239g-2685-54x3","revision":"d361fae8f5b14c99841eecff384eb781","records":[{"revision":"d361fae8f5b14c99841eecff384eb781","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"GHSA-239g-2685-54x3","aliases":["CVE-2026-35355"],"title":"install: TOCTOU symlink race (unlink-then-create without O_EXCL) allows arbitrary file overwrite","description":"`copy_file` in `install/src/install.rs` removes the destination then recreates it by pathname via `File::create` / `fs::copy` without `O_EXCL`/`create_new`. Between the unlink and the recreate, a local attacker with write access to the destination directory can drop in a symlink and redirect the write.\n\n**Impact:** when `install` runs privileged into an attacker-writable directory (staging/build paths), the race allows redirecting writes to arbitrary files and overwriting sensitive system files (`/etc/passwd`, `/etc/shadow`). Recommendation: create atomically with `create_new`/`O_EXCL` and copy via the opened fd rather than reopening by path.\n\n**Remediation:** Acknowledged by Canonical; fixed in commit b5bbabc1.\n\n---\n_Reported by Zellic in the *uutils coreutils Program Security Assessment* (prepared for Canonical, Jan 20 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`. Finding 3.50. Credit: Zellic._","state":0,"publishedAt":"2026-07-06T19:54:08+00:00","modifiedAt":"2026-07-06T20:11:15.72523+00:00","affected":[{"ecosystem":"crates.io","name":"uu_install","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.6.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/uutils/coreutils/security/advisories/GHSA-239g-2685-54x3","https://nvd.nist.gov/vuln/detail/CVE-2026-35355","https://github.com/uutils/coreutils/pull/10067","https://github.com/uutils/coreutils/commit/b5bbabc18a1121908848d836f869a4e98eb63886","https://github.com/uutils/coreutils","https://github.com/uutils/coreutils/releases/tag/0.6.0"],"sourceUrl":"https://github.com/advisories/GHSA-239g-2685-54x3","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-239g-2685-54x3","identifiers":["GHSA-239g-2685-54x3","CVE-2026-35355"]},"retained":false,"historicalAffected":[]}],"coverage":[]}