{"id":"CVE-2026-43529","aliases":["EUVD-2026-27269","GHSA-gj9q-8w99-mp8j"],"status":"published","title":"OpenClaw \u003c 2026.4.10 - Time-of-Check-Time-of-Use (TOCTOU) Race Condition in exec Script Preflight Validator","description":"OpenClaw before 2026.4.10 contains a time-of-check-time-of-use vulnerability in the validateScriptFileForShellBleed function that allows local attackers to bypass workspace boundary checks. An attacker with workspace write access can race-condition swap the target file between validation and preflight read, causing the validator to inspect a different file identity than the one that passed the initial boundary check.","severity":{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00079,"percentile":0.00138,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-367"],"published":"2026-04-16T21:19:21Z","modified":"2026-10-28T02:30:29Z","fixes":[{"ecosystem":"npm","package":"openclaw","fixed_in":["2026.4.10"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"openclaw","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2026.4.10"}]}]},{"source":"osv","ecosystem":"npm","package":"openclaw","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2026.4.10"}]}]}],"products":[{"vendor":"openclaw","product":"openclaw"}],"references":[{"url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-gj9q-8w99-mp8j","tags":["vendor-advisory","Vendor Advisory","advisory","web"]},{"url":"https://github.com/openclaw/openclaw/commit/b024fae9e5df43e9b69b2daebb72be3469d52e91","tags":["patch","Patch","fix","web"]},{"url":"https://www.vulncheck.com/advisories/openclaw-time-of-check-time-of-use-toctou-race-condition-in-exec-script-preflight-validator","tags":["third-party-advisory","Third Party Advisory","advisory"]},{"url":"https://github.com/openclaw/openclaw/pull/62333","tags":["web"]},{"url":"https://github.com/advisories/GHSA-gj9q-8w99-mp8j"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43529.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43529","tags":["advisory"]},{"url":"https://github.com/openclaw/openclaw","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-43529","title":"OpenClaw \u003c 2026.4.10 - Time-of-Check-Time-of-Use (TOCTOU) Race Condition in exec Script Preflight Validator","description":"OpenClaw before 2026.4.10 contains a time-of-check-time-of-use vulnerability in the validateScriptFileForShellBleed function that allows local attackers to bypass workspace boundary checks. An attacker with workspace write access can race-condition swap the target file between validation and preflight read, causing the validator to inspect a different file identity than the one that passed the initial boundary check.","status":"published","published":"2026-05-05T11:25:00.303Z","modified":"2026-05-05T12:18:10.908Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"low","assessor":"cna"},{"version":"3.1","score":2.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T13:37:25.103021Z"}],"euvd":[{"id":"EUVD-2026-27269","description":"OpenClaw before 2026.4.10 contains a time-of-check-time-of-use vulnerability in the validateScriptFileForShellBleed function that allows local attackers to bypass workspace boundary checks. An attacker with workspace write access can race-condition swap the target file between validation and preflight read, causing the validator to inspect a different file identity than the one that passed the initial boundary check.","status":"published","published":"2026-05-05T11:25:00Z","modified":"2026-05-05T12:18:10Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"low"}],"updated_at":"2026-11-02T19:05:17.068199Z"}],"ghsa":[{"id":"GHSA-gj9q-8w99-mp8j","title":"OpenClaw: TOCTOU read in exec script preflight","description":"## Summary\n\nOpenClaw's exec script preflight validator previously validated and then read a script by mutable pathname. A local race could swap the path between validation and read, causing preflight analysis to inspect a different file identity than the one that passed the workspace boundary check.\n\n## Affected Packages / Versions\n\n- Package: `openclaw`\n- Ecosystem: npm\n- Affected versions: `\u003c 2026.4.10`\n- Patched versions: `\u003e= 2026.4.10`\n\n## Impact\n\nThe impact is limited. This was not arbitrary full-file disclosure through the preflight error path. The validator only surfaced derived preflight content, such as a matched token, a line number, or the first non-empty JavaScript line in one branch. Exploitation also required the ability to mutate the relevant workspace path during the preflight window.\n\nStill, this was a real TOCTOU boundary bug in code that is supposed to reason about workspace-local script files before execution. A file identity that passed the initial boundary validation could differ from the identity that was later read for preflight analysis.\n\n## Technical Details\n\nThe vulnerable flow performed separate path validation and file reads in `validateScriptFileForShellBleed`. Because the read was path-based, an attacker with write access to the workspace path could race replacement of the target after validation but before preflight read.\n\n## Fix\n\nPR #62333 replaced the check-then-read flow with a pinned safe-open/read path using the shared `readFileWithinRoot` helper. The fixed path performs boundary verification around the opened file identity and avoids relying on a mutable pathname for the final preflight read. Regression tests cover both pre-open and post-open swap windows.\n\n## Fix Commit(s)\n\n- `b024fae9e5df43e9b69b2daebb72be3469d52e91` (`fix(exec): replace TOCTOU check-then-read with atomic pinned-fd open in script preflight [AI]`)\n- PR: #62333\n\n## Release Process Note\n\nThe fix first shipped in `v2026.4.10`. Users should upgrade to `openclaw` `2026.4.10` or newer; the latest npm release already includes the fix.\n\n## Credits\n\nThanks to @kikayli for reporting this issue.","status":"published","published":"2026-04-16T21:19:21Z","modified":"2026-05-05T11:57:02Z","cvss":[{"version":"4.0","score":2.1,"vector":"CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T14:40:00.970271Z"}],"nvd":[{"id":"CVE-2026-43529","description":"OpenClaw before 2026.4.10 contains a time-of-check-time-of-use vulnerability in the validateScriptFileForShellBleed function that allows local attackers to bypass workspace boundary checks. An attacker with workspace write access can race-condition swap the target file between validation and preflight read, causing the validator to inspect a different file identity than the one that passed the initial boundary check.","status":"published","published":"2026-05-05T12:16:19.057Z","modified":"2026-06-17T10:49:51.57Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":2.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"secondary"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T14:12:17.022502Z"}],"osv":[{"id":"CVE-2026-43529","title":"OpenClaw \u003c 2026.4.10 - Time-of-Check-Time-of-Use (TOCTOU) Race Condition in exec Script Preflight Validator","description":"OpenClaw before 2026.4.10 contains a time-of-check-time-of-use vulnerability in the validateScriptFileForShellBleed function that allows local attackers to bypass workspace boundary checks. An attacker with workspace write access can race-condition swap the target file between validation and preflight read, causing the validator to inspect a different file identity than the one that passed the initial boundary check.","status":"published","published":"2026-05-05T11:25:00.303Z","modified":"2026-10-28T02:30:29.340144197Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T15:45:04.820169Z"},{"id":"GHSA-gj9q-8w99-mp8j","title":"OpenClaw: TOCTOU read in exec script preflight","description":"## Summary\n\nOpenClaw's exec script preflight validator previously validated and then read a script by mutable pathname. A local race could swap the path between validation and read, causing preflight analysis to inspect a different file identity than the one that passed the workspace boundary check.\n\n## Affected Packages / Versions\n\n- Package: `openclaw`\n- Ecosystem: npm\n- Affected versions: `\u003c 2026.4.10`\n- Patched versions: `\u003e= 2026.4.10`\n\n## Impact\n\nThe impact is limited. This was not arbitrary full-file disclosure through the preflight error path. The validator only surfaced derived preflight content, such as a matched token, a line number, or the first non-empty JavaScript line in one branch. Exploitation also required the ability to mutate the relevant workspace path during the preflight window.\n\nStill, this was a real TOCTOU boundary bug in code that is supposed to reason about workspace-local script files before execution. A file identity that passed the initial boundary validation could differ from the identity that was later read for preflight analysis.\n\n## Technical Details\n\nThe vulnerable flow performed separate path validation and file reads in `validateScriptFileForShellBleed`. Because the read was path-based, an attacker with write access to the workspace path could race replacement of the target after validation but before preflight read.\n\n## Fix\n\nPR #62333 replaced the check-then-read flow with a pinned safe-open/read path using the shared `readFileWithinRoot` helper. The fixed path performs boundary verification around the opened file identity and avoids relying on a mutable pathname for the final preflight read. Regression tests cover both pre-open and post-open swap windows.\n\n## Fix Commit(s)\n\n- `b024fae9e5df43e9b69b2daebb72be3469d52e91` (`fix(exec): replace TOCTOU check-then-read with atomic pinned-fd open in script preflight [AI]`)\n- PR: #62333\n\n## Release Process Note\n\nThe fix first shipped in `v2026.4.10`. Users should upgrade to `openclaw` `2026.4.10` or newer; the latest npm release already includes the fix.\n\n## Credits\n\nThanks to @kikayli for reporting this issue.","status":"published","published":"2026-04-16T21:19:21Z","modified":"2026-05-05T16:11:37.316637Z","cvss":[{"version":"4.0","score":2.1,"vector":"CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T15:46:47.822182Z"}]}}