CVE-2026-67550
Medium
Description
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.
SeverityMedium
CVSS5.7
Exploit probability5. percentile0.2%
ProductRe2
PublishedJul 30, 2026
First seenJul 30, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Update
- re21.25.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| re2npm | v < 1.25.2 | 1.25.2 |
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