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CVE-2026-4271— Libsoup: libsoup: denial of service via use-after-free in http/2 server

CVSS 5.3 · Medium EPSS 0.93% · P76

Affected Version Matrix 7

VendorProductVersion RangeStatus
Red HatRed Hat Enterprise Linux 100:3.6.5-3.el10_1.11< *unaffected
0:3.6.5-3.el10_2.11< *unaffected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support0:3.6.5-3.el10_0.15< *unaffected
Red HatRed Hat Enterprise Linux 6anyaffected
Red HatRed Hat Enterprise Linux 7anyunaffected
Red HatRed Hat Enterprise Linux 8anyunaffected
Red HatRed Hat Enterprise Linux 9anyunaffected
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I. Basic Information for CVE-2026-4271

Vulnerability Information
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Vulnerability Title
Libsoup: libsoup: denial of service via use-after-free in http/2 server
Source: NVD (National Vulnerability Database)
Vulnerability Description
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).
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
释放后使用
Source: NVD (National Vulnerability Database)
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HTTP/2服务器实现中存在释放后重用漏洞，可能导致远程攻击者通过发送特制的HTTP/2请求导致身份验证失败，从而引发拒绝服务。
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

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat Enterprise Linux 10 0:3.6.5-3.el10_1.11 ~ * cpe:/o:redhat:enterprise_linux:10.1
Red HatRed Hat Enterprise Linux 10 0:3.6.5-3.el10_2.11 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support 0:3.6.5-3.el10_0.15 ~ * cpe:/o:redhat:enterprise_linux_eus:10.0
Red HatRed Hat Enterprise Linux 6-cpe:/o:redhat:enterprise_linux:6
Red HatRed Hat Enterprise Linux 7-cpe:/o:redhat:enterprise_linux:7
Red HatRed Hat Enterprise Linux 8-cpe:/o:redhat:enterprise_linux:8
Red HatRed Hat Enterprise Linux 9-cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-4271

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III. Intelligence Information for CVE-2026-4271

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Vendor Advisories for CVE-2026-4271 (5)

Other References for CVE-2026-4271 (1)

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

CVE-2026-43245.4 MEDIUMRubygem-katello: katello: denial of service and potential information disclosure via sql i
CVE-2026-36323.9 LOWLibsoup: libsoup: http smuggling and server-side request forgery via malformed hostnames
CVE-2026-36343.9 LOWLibsoup: libsoup: http header injection and response splitting via crlf injection in conte
CVE-2026-36333.9 LOWLibsoup: 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-416

V. Comments for CVE-2026-4271

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