Use After Free in Gnome Libsoup

CVE-2026-4271

A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests t…

Vulnerability class: Use-After-Free

EPSS: 0.009 (76.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-4271?
CVE-2026-4271 is a medium-severity vulnerability in Gnome Libsoup, classified under Use After Free. CVSS score: 5.3/10. Published 2026-03-17.
How severe is CVE-2026-4271?
Medium severity. CVSS v3 base score is 5.3 out of 10.