CVE-2026-67550 PUBLISHED

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

Assigner: GitHub_M
Reserved: 29.07.2026 Published: 30.07.2026 Updated: 30.07.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
CVSS Score: 5.7

Product Status

Vendor uhop
Product node-re2
Versions
  • Version < 1.25.2 is affected

References

Problem Types

  • CWE-125: Out-of-bounds Read CWE