Vulnerability in Rdfjs N3.js
CVE-2026-109563
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.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
Published .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/rdfjs/N3.js/pull/760 (issue-tracking, patch)
- github.com/rdfjs/N3.js/commit/b1c497fddb02c4772d61916bd2634115f45f424d (patch)
- github.com/rdfjs/N3.js (product)
- www.vulncheck.com/advisories/n3-js-before-2.11.1-redos-via-n3lexer-numeric-lite… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109563?
- CVE-2026-109563 is a high-severity vulnerability in Rdfjs N3.js, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2026-10-12.
- How severe is CVE-2026-109563?
- High severity. CVSS v3 base score is 7.5 out of 10.