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.
Published: 2026-08-20
Score: 5.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories

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History

Thu, 20 Aug 2026 22:45:00 +0000

Type Values Removed Values Added
Title Insufficient Entropy in libexpat Enables Hash Flooding Denial of Service

Thu, 20 Aug 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 20 Aug 2026 18:00:00 +0000

Type Values Removed Values Added
References

Thu, 20 Aug 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Thu, 20 Aug 2026 07:45:00 +0000

Type Values Removed Values Added
Title Insufficient Entropy in libexpat Enables Hash Flooding Denial of Service

Thu, 20 Aug 2026 04:45:00 +0000

Type Values Removed Values Added
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.
First Time appeared Libexpat Project
Libexpat Project libexpat
Weaknesses CWE-394
CPEs cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*
Vendors & Products Libexpat Project
Libexpat Project libexpat
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Subscriptions

Libexpat Project Libexpat
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-08-20T17:42:38.849Z

Reserved: 2026-08-20T04:22:50.503Z

Link: CVE-2026-76956

cve-icon Vulnrichment

Updated: 2026-08-20T15:22:07.648Z

cve-icon NVD

Status : Received

Published: 2026-08-20T05:16:29.610

Modified: 2026-08-20T18:16:52.343

Link: CVE-2026-76956

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-20T22:30:05Z

Weaknesses
  • CWE-394

    Unexpected Status Code or Return Value