{"id":"GHSA-x4hg-hfwf-p9mw","aliases":[],"status":"published","title":"@asymmetric-effort/nogginlessdom vulnerable to ReDoS via user-controlled regex in HTMLInputElement pattern validation","description":"## Summary\n\nThe `HTMLInputElement.checkValidity()` method constructed a `RegExp` directly from the user-controlled `pattern` property without any sanitization or timeout protection. This allowed an attacker to inject a regex with catastrophic backtracking, freezing the event loop.\n\n## Fix\n\nFixed in commit https://github.com/asymmetric-effort/NogginLessDom/commit/25a3cbac665fae5663f8b71c073b80c3152dbe7b on `main`. Added:\n- Pattern length limit (1024 characters)\n- Nested quantifier detection (`hasNestedQuantifiers`) that rejects patterns like `(a+)+` before constructing the regex\n- Patterns exceeding limits are treated as non-matching (safe default)","severity":{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium","from":"ghsa"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1333"],"published":"2026-07-02T20:20:04Z","modified":"2026-09-10T03:50:53Z","fixes":[{"ecosystem":"npm","package":"@asymmetric-effort/nogginlessdom","fixed_in":["0.0.22"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@asymmetric-effort/nogginlessdom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.0.21"},{"fixed":"0.0.22"}]}]},{"source":"osv","ecosystem":"npm","package":"@asymmetric-effort/nogginlessdom","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.0.22"}]}]}],"references":[{"url":"https://github.com/asymmetric-effort/NogginLessDom/security/advisories/GHSA-x4hg-hfwf-p9mw","tags":["web"]},{"url":"https://github.com/asymmetric-effort/NogginLessDom/commit/25a3cbac665fae5663f8b71c073b80c3152dbe7b","tags":["web"]},{"url":"https://github.com/advisories/GHSA-x4hg-hfwf-p9mw"},{"url":"https://github.com/asymmetric-effort/NogginLessDom","tags":["package"]}],"sources":{"ghsa":[{"id":"GHSA-x4hg-hfwf-p9mw","title":"@asymmetric-effort/nogginlessdom vulnerable to ReDoS via user-controlled regex in HTMLInputElement pattern validation","description":"## Summary\n\nThe `HTMLInputElement.checkValidity()` method constructed a `RegExp` directly from the user-controlled `pattern` property without any sanitization or timeout protection. This allowed an attacker to inject a regex with catastrophic backtracking, freezing the event loop.\n\n## Fix\n\nFixed in commit https://github.com/asymmetric-effort/NogginLessDom/commit/25a3cbac665fae5663f8b71c073b80c3152dbe7b on `main`. Added:\n- Pattern length limit (1024 characters)\n- Nested quantifier detection (`hasNestedQuantifiers`) that rejects patterns like `(a+)+` before constructing the regex\n- Patterns exceeding limits are treated as non-matching (safe default)","status":"published","published":"2026-07-02T20:20:04Z","modified":"2026-07-02T20:20:04Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:40:38.48196Z"}],"osv":[{"id":"GHSA-x4hg-hfwf-p9mw","title":"@asymmetric-effort/nogginlessdom vulnerable to ReDoS via user-controlled regex in HTMLInputElement pattern validation","description":"## Summary\n\nThe `HTMLInputElement.checkValidity()` method constructed a `RegExp` directly from the user-controlled `pattern` property without any sanitization or timeout protection. This allowed an attacker to inject a regex with catastrophic backtracking, freezing the event loop.\n\n## Fix\n\nFixed in commit https://github.com/asymmetric-effort/NogginLessDom/commit/25a3cbac665fae5663f8b71c073b80c3152dbe7b on `main`. Added:\n- Pattern length limit (1024 characters)\n- Nested quantifier detection (`hasNestedQuantifiers`) that rejects patterns like `(a+)+` before constructing the regex\n- Patterns exceeding limits are treated as non-matching (safe default)","status":"published","published":"2026-07-02T20:20:04Z","modified":"2026-09-10T03:50:53.05386696Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T15:46:59.484835Z"}]}}