CVE-2026-109563
HIGH 8.7N3.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.
Severe if exploited (CVSS 8.7), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.3%chance of exploitation in 30 days · 28th percentile
Impact if exploited
8.7CVSS 4.0 · HIGH
- ConfidentialityNone
- IntegrityNone
- AvailabilityHigh
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
- ✓Requirements: No special attack requirements
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Data snapshot:
Weakness (CWE)
- CWE-1333: Inefficient Regular Expression Complexity
CVSS 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
References and research data (JSON)
All CVSS metrics
- HIGH 8.7 v4.0 · CNA Primary
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 - HIGH 7.5 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - HIGH 8.7 v4.0 · NVD Secondary
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - HIGH 7.5 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
Patches & mitigations
- https://github.com/rdfjs/N3.js/pull/760 CVE record · VulnCheck · Updated 2026-10-12T20:55:16.880Z
NVD · CVE-2026-109563 · Updated 2026-10-16T19:15:07.947 - https://github.com/rdfjs/N3.js/commit/b1c497fddb02c4772d61916bd2634115f45f424d CVE record · VulnCheck · Updated 2026-10-12T20:55:16.880Z
NVD · CVE-2026-109563 · Updated 2026-10-16T19:15:07.947
Advisories
- https://www.vulncheck.com/advisories/n3-js-before-2.11.1-redos-via-n3lexer-numeric-literal-regex CVE record · VulnCheck · Updated 2026-10-12T20:55:16.880Z
NVD · CVE-2026-109563 · Updated 2026-10-16T19:15:07.947 - https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-97886 EUVD · EUVD-2026-97886
Technical & other
- https://github.com/rdfjs/N3.js CVE record · VulnCheck · Updated 2026-10-12T20:55:16.880Z
NVD · CVE-2026-109563 · Updated 2026-10-16T19:15:07.947