Description
libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.
Published: 2026-10-22
Score: 8.7 High
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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History

Fri, 23 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
Description libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.
Title libexpat through 2.9.0 Denial of Service via Billion Laughs Detection Delay
First Time appeared Libexpat Project
Libexpat Project libexpat
Weaknesses CWE-776
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'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Libexpat Project Libexpat
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-22T19:14:06.001Z

Reserved: 2026-10-22T16:14:59.466Z

Link: CVE-2026-115506

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-22T20:17:06.620

Modified: 2026-10-22T20:17:06.620

Link: CVE-2026-115506

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T06:15:12Z

Weaknesses