CVE-2026-109563 N3.js before 2.11.1 ReDoS via N3Lexer Numeric-Literal Regex
Attackers can cause denial of service in applications using N3.js by supplying crafted Turtle or N3 input with long digit runs, blocking the Node.js event loop.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-109563?
CVE-2026-109563 is a high-severity denial of service vulnerability in rdfjs N3.js, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-1333
Which versions are affected by CVE-2026-109563?
How do I fix CVE-2026-109563?
No fix has been published for CVE-2026-109563 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-109563 being exploited?
There is no known exploitation of CVE-2026-109563 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-109563, GHSA-xf53-x4jg-3wwc, UBUNTU-CVE-2026-109563.