{"id":"CVE-2026-67550","aliases":["GHSA-ff84-5f28-78qj"],"url":"https://o3.security/vulnerability/CVE-2026-67550","summary":"re2: Out-of-bounds heap read in `exec`/`test`/`match` via attacker-influenced `lastIndex` on a non-ASCII subject → uncatchable process crash (DoS)","details":"re2 provides Node.js bindings for Google's RE2 regular expression engine. Prior to 1.25.2, re2 validates lastIndex against the UTF-8 byte length of a subject but uses it as a UTF-16 code-unit offset in exec, test, match, replace, and split, allowing an attacker-influenced lastIndex on a non-ASCII subject to trigger an out-of-bounds heap read and an uncatchable process crash, with limited heap information disclosure in some cases. This issue is fixed in 1.25.2.","published":"2026-07-30T19:59:55.916Z","modified":"2026-09-12T08:07:28.033868Z","cvss":{"score":5.7,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H"},"epss":{"score":0.0018,"percentile":0.07715,"asOf":"2026-09-14"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"re2","fixedVersion":"1.25.2"}],"fix":{"url":"https://github.com/uhop/node-re2/commit/56293de4fc0914d7bc35f92e98de25b0d9bb417d","label":"uhop/node-re2@56293de"},"references":[{"type":"WEB","url":"https://github.com/uhop/node-re2/releases/tag/1.25.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67550.json"},{"type":"ADVISORY","url":"https://github.com/uhop/node-re2/security/advisories/GHSA-ff84-5f28-78qj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67550"},{"type":"FIX","url":"https://github.com/uhop/node-re2/commit/56293de4fc0914d7bc35f92e98de25b0d9bb417d"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-12T08:07:28.033868Z"}}