CVE-2026-67550

A flaw was found in re2, a component that provides Node.js bindings for Google's RE2 regular expression engine. An attacker can exploit a vulnerability by manipulating the lastIndex parameter with a non-ASCII input. This manipulation can lead to an out-of-bounds heap read, causing the process to...

GHSA-FF84-5F28-78QJ re2: Out-of-bounds heap read in `exec`/`test`/`match` via attacker-influenced `lastIndex` on a non-ASCII subject → uncatchable process crash (DoS)

Summary re2 validates the user-settable lastIndex against the subject's UTF-8 byte length but then uses it as a UTF-16 code-unit count to walk the subject buffer, with no bounds check. For any non-ASCII subject, the byte length is larger than the true character count, so a lastIndex between those...

NPM: re2: Global `String.prototype.match` with an empty-matchable pattern never advances → infinite loop with unbounded native memory growth (DoS)

NPM: re2: Global String.prototype.match with an empty-matchable pattern never advances → infinite loop with unbounded native memory growth DoS vulnerability discovered by ? in WordPress Npm re2 versions = 1.25.1...