Description
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.
Affected products
gnome: libsoup; redhat: enterprise linux
References3
- access.redhat.com/security/cve/CVE-2026-3632 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2445127 Issue TrackingVendor Advisory
- gitlab.gnome.org/GNOME/libsoup/-/issues/483 ExploitIssue TrackingVendor Advisory
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L - EPSS — exploit probability
- 0% percentile: 16 · as of 12 November 2026
- CWE
- CWE-1286
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.