Hash Flooding Vulnerability in libexpat XML Parser Before

Publication date: 2026-04-16

Last updated on: 2026-06-12

Assigner: MITRE

Description

libexpat before 2.8.0 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-04-16

Last Modified

2026-06-12

Generated

2026-07-06

AI Q&A

2026-04-16

EPSS Evaluated

2026-07-05

NVD

CVE-2026-41080

EUVD

EUVD-2026-23276

Affected Vendors & Products

Vendor	Product	Version / Range
libexpat_project	libexpat	to 2.8.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-331	The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.

Attack-Flow Graph

Executive Summary

This vulnerability exists in libexpat versions before 2.7.6. It is caused by the use of insufficient entropy in the library's processing, which allows an attacker to perform hash flooding by crafting a malicious XML document.

Impact Analysis

The vulnerability can lead to hash flooding attacks, which may cause a denial of service by making the XML processing consume excessive resources. According to the CVSS score, the impact on availability is low, and there is no impact on confidentiality or integrity.

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