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CVE-2026-3632— Libsoup: libsoup: http smuggling and server-side request forgery via malformed hostnames

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libsoup是GNOME项目的一款GNOME的HTTP客户端/服务器库。 libsoup存在安全漏洞，该漏洞源于未正确验证主机名，允许将特殊字符注入HTTP标头，可能导致远程攻击者执行HTTP请求夹带，进而造成服务端请求伪造。

CVSS 3.9 · Low EPSS 0.35% · P26
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I. Basic Information for CVE-2026-3632

Vulnerability Information
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Vulnerability Title
Libsoup: libsoup: http smuggling and server-side request forgery via malformed hostnames
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1286
Source: CVE Program / CVE List V5
Vulnerability Title
libsoup 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libsoup是GNOME项目的一款GNOME的HTTP客户端/服务器库。 libsoup存在安全漏洞，该漏洞源于未正确验证主机名，允许将特殊字符注入HTTP标头，可能导致远程攻击者执行HTTP请求夹带，进而造成服务端请求伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-3632

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III. Intelligence Information for CVE-2026-3632

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Patches & Fixes for CVE-2026-3632 (1)

Vendor Advisories for CVE-2026-3632 (2)

Same Patch Batch · Red Hat · 2026-03-17 · 5 CVEs total

CVE-2026-4324 5.4 MEDIUM Rubygem-katello: katello: denial of service and potential information disclosure via sql i
CVE-2026-4271 5.3 MEDIUM Libsoup: libsoup: denial of service via use-after-free in http/2 server
CVE-2026-3634 3.9 LOW Libsoup: libsoup: http header injection and response splitting via crlf injection in conte
CVE-2026-3633 3.9 LOW Libsoup: libsoup: header and http request injection via crlf injection

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-1286

V. Comments for CVE-2026-3632

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