CVE-2026-56404
A local attacker can exploit multiple vulnerabilities in libexpat to conduct an unspecified attack, potentially including arbitrary code execution, data manipulation, bypassing security measures, disclosing confidential information, or causing a Denial of Service condition.
CSIRTS triage
- What
- A local attacker can exploit multiple vulnerabilities in libexpat to conduct an unspecified attack, potentially including arbitrary code execution, data manipulation, bypassing security measures, disclosing confidential information, or causing a Denial of Service condition.
- Who is affected
- Users of libexpat.
- Urgency
- Remediation is medium urgency due to the wide range of potential impacts.
- Action
- Update to the latest version of libexpat to mitigate these vulnerabilities.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.
Advisory coverage (3)
- medium[UPDATE] [medium] libexpat: Multiple vulnerabilities allow unspecified attackcert-bund · 2026-08-24
- unknownDSA-6404-1 expat - security updatedebian · 2026-07-30
- 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)