CVE-2026-76956
A remote, anonymous attacker can exploit a vulnerability in expat to perform a denial of service attack.
CSIRTS triage
- What
- expat contains a vulnerability enabling remote denial of service attacks.
- Who is affected
- Deployments and applications using expat XML parser are affected by remote unauthenticated attackers.
- Urgency
- Medium urgency; denial of service impact is significant but does not enable data breach or code execution.
- Action
- Update expat library to a patched version addressing CVE-2026-76956.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 16% of all EPSS-scored CVEs.
Advisory coverage (3)
- medium[NEW] [medium] expat: Vulnerability enables denial of servicecert-bund · 2026-08-20
- mediumCVE-2026-76956: In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads …nvd · 2026-08-20
- highCVE-2026-76956: In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads …msrc · 2026-08-11
External references
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[](https://www.csirts.com/cve/CVE-2026-76956)