Medium severity · published Jul 30, 2026
CVE-2026-67550
re2: Out-of-bounds heap read in `exec`/`test`/`match` via attacker-influenced `lastIndex` on a non-ASCII subject → uncatchable process crash (DoS)
5.7
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
Attack vector
Local
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 5% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NO
node-re2 · uhop
< 1.25.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-67550
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-67550
github.com
https://github.com/uhop/node-re2/commit/56293de4fc0914d7bc35f92e98de25b0d9bb417d
github.com
https://github.com/uhop/node-re2/releases/tag/1.25.2
github.com
https://github.com/uhop/node-re2/security/advisories/GHSA-ff84-5f28-78qj
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