CVE-2026-56403 in libexpat

Summary

by MITRE • 06/21/2026

libexpat before 2.8.2 has an integer overflow in storeAtts.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

• Responsible: MITRE
• Reservation: 06/21/2026
• Disclosure: 06/21/2026
• Moderation: accepted
• Entry: VDB-372638
• CPE: ready
• CWE: CWE-190 (confirmed)
• CVSS: 6.9 (CNA)
• EPSS: 0.00000
• KEV: no
• Activities: low

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-56403
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-56403
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-56403/