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Vulnerability record · CVE-2026-76956 · published 20 August 2026

CVE-2026-76956: Libexpat project libexpat vulnerability

LLibexpat Project · Libexpat

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.

7.5 CVSS 3.1 High EPSS 0.45% · top 63.3% CWE-394 · CWE-394
7.5CVSS 3.1 base score
0.45%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
8 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/libexpat/libexpat/pull/1326 Issue TrackingPatch
https://github.com/libexpat/libexpat/pull/1329 Issue TrackingPatch

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-45491Libexpat project libexpat integer overflow vulnerabilityAn issue was discovered in libexpat before 2.6.3. dtdCopy in xmlparse.c can have an integer overflow for nDefaultAtts on 32-bit platforms (where UINT…EPSS 1.1%9.8CVE-2024-45492Libexpat project libexpat integer overflow vulnerabilityAn issue was discovered in libexpat before 2.6.3. nextScaffoldPart in xmlparse.c can have an integer overflow for m_groupSize on 32-bit platforms (wh…EPSS 1.4%9.8CVE-2022-25315Libexpat project libexpat integer overflow vulnerabilityIn Expat (aka libexpat) before 2.4.5, there is an integer overflow in storeRawNames.EPSS 4.8%9.8CVE-2022-25235Libexpat project libexpat vulnerabilityxmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a c…EPSS 5.0%9.8CVE-2022-25236Libexpat project libexpat exposure of resource to wrong sphere vulnerabilityxmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs.EPSS 36%9.8CVE-2022-23852Libexpat project libexpat integer overflow vulnerabilityExpat (aka libexpat) before 2.4.4 has a signed integer overflow in XML_GetBuffer, for configurations with a nonzero XML_CONTEXT_BYTES.EPSS 4.6%9.8CVE-2022-22822Libexpat project libexpat integer overflow vulnerabilityaddBinding in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.EPSS 4.8%9.8CVE-2022-22823Libexpat project libexpat integer overflow vulnerabilitybuild_model in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.EPSS 3.4%

Source: NIST National Vulnerability Database (record CVE-2026-76956), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.