Common Weakness Enumeration
CWE-394
AllowedUnexpected Status Code or Return Value
Abstraction: Base · Status: Draft
The product does not properly check when a function or operation returns a value that is legitimate for the function, but is not expected by the product.
31 vulnerabilities reference this CWE, most recent first.
GHSA-X282-Q22W-C9HM
Vulnerability from github – Published: 2026-08-20 06:32 – Updated: 2026-08-20 18:30
VLAI
Details
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.
Severity
7.5 (High)
{
"affected": [],
"aliases": [
"CVE-2026-76956"
],
"database_specific": {
"cwe_ids": [
"CWE-394"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-20T05:16:29Z",
"severity": "HIGH"
},
"details": "In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy\u0027s return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.",
"id": "GHSA-x282-q22w-c9hm",
"modified": "2026-08-20T18:30:48Z",
"published": "2026-08-20T06:32:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76956"
},
{
"type": "WEB",
"url": "https://github.com/libexpat/libexpat/pull/1326"
},
{
"type": "WEB",
"url": "https://github.com/libexpat/libexpat/pull/1329"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.