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CVE-2026-76956 Details

Description

In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CNA: [email protected]CVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/libexpat/libexpat/pull/1326	[email protected]	Issue TrackingPatch
https://github.com/libexpat/libexpat/pull/1329	[email protected]	Issue TrackingPatch

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-394	Unexpected Status Code or Return Value	[email protected]

Affected Products

Product	Versions
libexpat project libexpat	>= 2.8.2, < 2.8.4
CPE cpe:2.3:a:libexpat_project:libexpat:::::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Sep 8, 2026	Initial Analysis	[email protected]
Aug 20, 2026	CVE Modified	[email protected]
Aug 20, 2026	CVE Modified	CISA-ADP
Aug 20, 2026	New CVE Received	[email protected]