Is CVE-2026-109563 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-109563?

CVE-2026-109563 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-109563

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.