CVE-2026-4271
highA flaw was found in libsoup, a library for handling HTTP requests.
Vendor / product: Gnome — libsoup
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 that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).
CVSS
7.5
7.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-03-17 12:16
Modified: 2026-11-05 21:18
NVD status: Modified
Last synced 2 hours ago
Verified against the source API 2026-11-05 21:23 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
gnome / libsoup all versions
redhat / enterprise_linux 6.0, 7.0, 8.0, 9.0, 10.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://access.redhat.com/security/cve/CVE-2026-4271
Vendor advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2448044
Vendor advisory: https://gitlab.gnome.org/GNOME/libsoup/-/issues/496
Vendor advisory: https://gitlab.gnome.org/GNOME/libsoup/-/issues/496
References
- https://access.redhat.com/errata/RHSA-2026:15968 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:17482 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:19143 secalert@redhat.com
- https://access.redhat.com/security/cve/CVE-2026-4271 secalert@redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2448044 secalert@redhat.com
- https://gitlab.gnome.org/GNOME/libsoup/-/issues/496 secalert@redhat.com
- https://gitlab.gnome.org/GNOME/libsoup/-/issues/496 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
NVD CVE API 2.0 — fetched 2026-11-05 21:23 UTC · record ↗