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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-67550
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-30 20:18:15 UTC
Updated2026-07-31 23:17:26 UTC
Descriptionre2 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.

Risk And Classification

Primary CVSS: v3.1 5.7 MEDIUM from [email protected]

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

EPSS: 0.001210000 probability, percentile 0.022110000 (date 2026-07-31)

Problem Types: CWE-125 | CWE-125 CWE-125: Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
3.1CNADECLARED5.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Uhop Node-re2 affected < 1.25.2 Not specified

References

ReferenceSourceLinkTags
github.com/uhop/node-re2/security/advisories/GHSA-ff84-5f28-78qj 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/uhop/node-re2/releases/tag/1.25.2 [email protected] github.com
github.com/uhop/node-re2/commit/56293de4fc0914d7bc35f92e98de25b0d9bb417d [email protected] github.com
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