Use After Free in Xmlsoft Libxslt

CVE-2024-55549

xsltGetInheritedNsList in libxslt before 1.1.43 has a use-after-free issue related to exclusion of result prefixes.

Vulnerability class: Use-After-Free

EPSS: 0.001 (27.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:H.

Affected products

Xmlsoft Libxslt — versions 0

Weakness classification (CWE)

CWE-416 — Use After Free

Public proof-of-concept exploits

References

gitlab.gnome.org/GNOME/libxslt/-/issues/127

Frequently asked questions

What is CVE-2024-55549?: CVE-2024-55549 is a high-severity vulnerability in Xmlsoft Libxslt, classified under Use After Free. CVSS score: 7.8/10. Published 2025-03-14.
How severe is CVE-2024-55549?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2024-55549 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.