{"id":"CVE-2026-35339","aliases":["GHSA-4x34-chg5-mwjj"],"title":"chmod: recursive mode returns exit code 0 even when some files fail (last-file-wins)","summary":"chmod: recursive mode returns exit code 0 even when some files fail (last-file-wins)","severity":"medium","cvss":5.5,"cwe":["CWE-252","CWE-253","CWE-755"],"vendor":"uu_chmod","product":"uu_chmod","ecosystem":"rust","affected":["uu_chmod < 0.6.0"],"patched":["uu_chmod 0.6.0"],"published":"2026-07-06","updated":"2026-07-06","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-4x34-chg5-mwjj","references":[{"url":"https://github.com/uutils/coreutils/security/advisories/GHSA-4x34-chg5-mwjj"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35339"},{"url":"https://github.com/uutils/coreutils/pull/9793"},{"url":"https://github.com/uutils/coreutils/commit/abd581f62e97d0b147306ac40eac13af71c6fbba"},{"url":"https://github.com/uutils/coreutils/releases/tag/0.6.0"},{"url":"https://github.com/advisories/GHSA-4x34-chg5-mwjj"}],"tags":["ghsa","rust"],"epss":0.00143,"epssPercentile":0.03945,"ingestedAt":"2026-07-06T19:45:46.975Z","slug":"CVE-2026-35339","body":"## Overview\n\nIn `Chmoder::chmod()` the recursive branch overwrites the running result instead of accumulating it, so the exit code reflects only the *last* file processed:\n\n```\nif self.recursive {\n    r = self.walk_dir_with_context(file, true);   // overwrites r\n} else {\n    r = self.chmod_file(file).and(r);\n}\n```\n\n**PoC:** GNU returns 1 when a file fails; uutils returns 0 if the last entry succeeds:\n\n```\n$ chmod -R 0755 chmod-bug/root chmod-bug/user  # GNU -> ret=1\n$ uutils chmod -R 0755 chmod-bug/root chmod-bug/user  # -> ret=0\n```\n\n**Impact:** scripts relying on the exit code get a false success signal while some files retained restrictive/unexpected permissions, leading to access-control misconfigurations. Recommendation: accumulate errors during traversal.\n\n**Remediation:** Acknowledged by Canonical; fixed in commit abd581f6.\n\n---\n_Reported by Zellic in the *uutils coreutils Program Security Assessment* (prepared for Canonical, Jan 20 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`. Finding 3.2. Credit: Zellic._\n\n## Affected packages\n\n- `uu_chmod < 0.6.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `uu_chmod 0.6.0`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}