CVE-2026-83613
XML parser flaw causes quadratic parsing and can stall Node.js event loop (DoS).
Is CVE-2026-83613 being exploited?
Not confirmed. CVE-2026-83613 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.34% probability of exploitation in the next 30 days.
How severe is CVE-2026-83613?
CVE-2026-83613 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-83613?
Yes. A fix has been recorded for CVE-2026-83613. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-83613 affect?
CVE-2026-83613 affects @xmldom/xmldom (versions prior to 0.8.15 and 0.9.12), xmldom (<= 0.6.0), Node.js apps parsing untrusted XML. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-83613?
Upgrade @xmldom/xmldom to >=0.8.15 or >=0.9.12; avoid/sandbox parsing untrusted XML.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Denial of Service: crafted XML with many attributes triggers quadratic work, consuming CPU and stalling the Node.js event loop.
Patch when possible
- affected<= 0.6.0
- affected>= 0.9.0 and < 0.9.12
- affected>= 0.7.0 and < 0.8.15
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.