CVE-2026-3632

A flaw was found in libsoup, a library used by applications to send network requests. This vulnerability occurs because libsoup does not properly validate hostnames, allowing special characters to be injected into HTTP headers. A remote attacker could exploit this to perform HTTP smuggling, where they can send hidden, malicious requests alongside legitimate ones. In certain situations, this could lead to Server-Side Request Forgery (SSRF), enabling an attacker to force the server to make unauthorized requests to other internal or external systems. The impact is low, as SoupServer is not actually used in internet infrastructure.

• CWE-1286

• https://access.redhat.com/security/cve/CVE-2026-3632Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2445127Issue Tracking, Vendor Advisory
• https://gitlab.gnome.org/GNOME/libsoup/-/issues/483Exploit, Issue Tracking, Vendor Advisory

Published

Mar 17, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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