CVE-2026-76956CWE-394

CVE-2026-76956

Medium · published August 20, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
20.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00287 · 20.2th percentile
Weakness
CWE-394 · Unexpected Status Code or Return Value
Published
2026-08-20T09:16Z
Affected products (1)
ProductVersionsFixed in
libexpat_project/libexpat≥ 2.8.2, < 2.8.42.8.4
References (2)
https://github.com/libexpat/libexpat/pull/1326 · [email protected]https://github.com/libexpat/libexpat/pull/1329 · [email protected]
EPSS history
Timeline
  • 20 AUG 04:22Z
    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…
    cvelistv5