Low [CVE-2026-3632] Libsoup: libsoup: http smuggling and server-side request forgery via malformed hostnames
This low-severity Red Hat Linux advisory covers CVE-2026-3632 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
Summary
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. This vulnerability has a LOW impact on Red Hat products.
The `libsoup` library, when used as a client, does not adequately validate hostnames, allowing for HTTP header injection. This could lead to HTTP smuggling or Server-Side Request Forgery (SSRF) if an application processes attacker-controlled URLs.
Red Hat severity: Low — CVSS 3.9 (CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L). Weakness: CWE-1286.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Will not fix / out of support: Red Hat Enterprise Linux 6.
Red Hat does not currently list a fixing RHSA for this CVE.
Is CVE-2026-3632 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-3632 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-3632?
The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
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