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CVE-2026-3633— Libsoup: libsoup: header and http request injection via crlf injection

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存在注入漏洞，该漏洞源于soup_message_new函数的方法参数未在请求行构造期间正确转义，可能导致远程攻击者注入任意标头和额外请求数据，造成CRLF注入。

CVSS 3.9 · Low EPSS 0.22% · P13
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I. Basic Information for CVE-2026-3633

Vulnerability Information
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Vulnerability Title
Libsoup: libsoup: header and http request injection via crlf injection
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in libsoup. A remote attacker, by controlling the method parameter of the `soup_message_new()` function, could inject arbitrary headers and additional request data. This vulnerability, known as CRLF (Carriage Return Line Feed) injection, occurs because the method value is not properly escaped during request line construction, potentially leading to HTTP request injection.
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
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
libsoup 注入漏洞
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存在注入漏洞，该漏洞源于soup_message_new函数的方法参数未在请求行构造期间正确转义，可能导致远程攻击者注入任意标头和额外请求数据，造成CRLF注入。
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-2026-3633

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III. Intelligence Information for CVE-2026-3633

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Vendor Advisories for CVE-2026-3633 (2)

Other References for CVE-2026-3633 (1)

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-2026-3632 3.9 LOW Libsoup: libsoup: http smuggling and server-side request forgery via malformed hostnames
CVE-2026-3634 3.9 LOW Libsoup: libsoup: http header injection and response splitting via crlf injection in conte

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-93

V. Comments for CVE-2026-3633

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