CVE-2026-66046
An attacker can exploit a vulnerability in expat to perform a denial of service attack.
CSIRTS triage
- What
- An attacker can exploit a vulnerability to perform a denial-of-service attack.
- Who is affected
- Applications and systems using vulnerable expat library.
- Urgency
- Medium severity; standard update cycle appropriate.
- Action
- Update expat library to a patched version.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2026-66046
Get an email if CVE-2026-66046 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Low exploitation risk0.68% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 49% of all EPSS-scored CVEs.
Advisory coverage (2)
- medium[NEW] [medium] expat: Vulnerability Enables Denial of Servicecert-bund · 2026-08-19
- highCVE-2026-66046: Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic…nvd · 2026-08-18
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-66046)