CVE-2026-56404
CSIRTS triage
- What
- An integer overflow vulnerability exists in libexpat's addBinding function.
- Who is affected
- Deployments of libexpat before version 2.8.2 are affected by this vulnerability.
- Urgency
- Remediation is medium priority due to the CVSS score of 6.9 indicating moderate risk.
- Action
- Upgrade libexpat to version 2.8.2 or later to mitigate this vulnerability.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.10% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all EPSS-scored CVEs.
Advisory coverage (1)
- mediumCVE-2026-56404: libexpat before 2.8.2 has an integer overflow in addBinding.msrc · 2026-06-09
External references
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[](https://www.csirts.com/cve/CVE-2026-56404)