---
id: CVE-2026-67550
title: re2 provides Node.js bindings for Google's RE2 regular expression engine
summary: >-
  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 spl…
severity: medium
cvss: 5.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H'
cwe:
  - CWE-125
vendor: re2
product: re2
affected:
  - re2 <= 1.25.1
patched:
  - re2 1.25.2
published: '2026-07-30'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T20:30:11.423'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67550'
references:
  - url: >-
      https://github.com/uhop/node-re2/commit/56293de4fc0914d7bc35f92e98de25b0d9bb417d
    label: security-advisories@github.com
  - url: 'https://github.com/uhop/node-re2/releases/tag/1.25.2'
    label: security-advisories@github.com
  - url: 'https://github.com/uhop/node-re2/security/advisories/GHSA-ff84-5f28-78qj'
    label: security-advisories@github.com
  - url: 'https://github.com/uhop/node-re2/security/advisories/GHSA-ff84-5f28-78qj'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67550'
  - url: 'https://github.com/advisories/GHSA-ff84-5f28-78qj'
tags:
  - nvd
  - ghsa
  - npm
epss: 0.00161
epssPercentile: 0.04609
aliases:
  - GHSA-ff84-5f28-78qj
ecosystem: npm
ingestedAt: '2026-07-31T16:59:59.747Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-67550)

Affected packages:

- `re2 <= 1.25.1`

Patched in:

- `re2 1.25.2`

Source: https://github.com/advisories/GHSA-ff84-5f28-78qj