CVE-2026-41080

libexpat: expat: libexpat: Denial of Service via hash flooding with crafted XML

Published Apr 16, 2026 CVSS 3.1 · 2.9 Low EPSS < 1% KEV · Not listed
Description
libexpat before 2.8.0 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-6404-1 expat security update
Ubuntu USN Ubuntu USN USN-8520-1 Expat vulnerability
Ubuntu USN Ubuntu USN USN-8790-1 Expat vulnerabilities
History
Type Values Removed Values Added
Description libexpat before 2.7.6 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document. libexpat before 2.8.0 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document.
References
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title libexpat: expat: libexpat: Denial of Service via hash flooding with crafted XML
References
Metrics threat_severity

None

threat_severity

Low

Type Values Removed Values Added
Description libexpat before 2.7.6 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document.
First Time appeared Libexpat Project
Libexpat Project libexpat
Weaknesses CWE-331
CPEs cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*
Vendors & Products Libexpat Project
Libexpat Project libexpat
References
Metrics cvssV3_1

{'score': 2.9, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Oct 15, 2026, 1:18 AM
Reserved
Apr 16, 2026, 4:52 PM
Status
Modified
Published
Apr 16, 2026, 5:16 PM
Modified
Jul 14, 2026, 1:18 PM
Severity
Low
Public date
Apr 16, 2026, 4:52 PM