---
id: CVE-2026-109563
title: >-
  N3.js before 2.11.1 contains a regular expression denial of service
  vulnerability in the N3Lexer number pattern that backtracks quadratically on
  long digit runs
summary: >-
  N3.js before 2.11.1 contains a regular expression denial of service
  vulnerability in the N3Lexer number pattern that backtracks quadratically on
  long digit runs. Attackers can supply untrusted Turtle or N3 input containing
  long runs of d…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-1333
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T21:17:12.713'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109563'
references:
  - url: 'https://github.com/rdfjs/N3.js'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/rdfjs/N3.js/commit/b1c497fddb02c4772d61916bd2634115f45f424d
    label: disclosure@vulncheck.com
  - url: 'https://github.com/rdfjs/N3.js/pull/760'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/n3-js-before-2.11.1-redos-via-n3lexer-numeric-literal-regex
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-12T22:05:40.359Z'
---

## Overview

N3.js before 2.11.1 contains a regular expression denial of service vulnerability in the N3Lexer number pattern that backtracks quadratically on long digit runs. Attackers can supply untrusted Turtle or N3 input containing long runs of digits that do not end a number, blocking the Node.js event loop and causing denial of service.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.