Heap memory disclosure via truncated UTF-8 Buffer
Published Aug 6, 2026 · Updated Aug 6, 2026
Out-of-bounds read in Eugene Lazutkin node-re2 before 1.26.1 allows attackers to disclose adjacent heap memory via a malformed Buffer. The native binding infers character width from the final UTF-8 lead byte without checking remaining input, so replace and split copy up to three out-of-bounds bytes into JavaScript. Exploitation requires application-controlled Buffer input ending in an incomplete multibyte sequence; string inputs are unaffected, and no heap grooming is required.
Summary
What happened
Out-of-bounds read in Eugene Lazutkin node-re2 before 1.26.1 allows attackers to disclose adjacent heap memory via a malformed Buffer. The native binding infers character width from the final UTF-8 lead byte without checking remaining input, so replace and split copy up to three out-of-bounds bytes into JavaScript. Exploitation requires application-controlled Buffer input ending in an incomplete multibyte sequence; string inputs are unaffected, and no heap grooming is required.
The record
- CVE
- CVE-2026-71498
- Published
- Aug 6, 2026
- Updated
- Aug 6, 2026
- Vendor
- Eugene Lazutkin
- Product
- node-re2
- Classifications
- CWE-125
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 6, 2026CVE publishedPublication date reported by the CVE source.
- Aug 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 1.26.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Deterministic truncated UTF-8 Buffer proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo