CVE-2026-3632

Libsoup: libsoup: http smuggling and server-side request forgery via malformed hostnames

State
Published
Severity
3.9 Low
Published
Mar 17, 2026
Updated
Mar 19, 2026
Reserved
Mar 6, 2026

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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.

Scores

CVSSScoreVectorSource
3.13.9 LowCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:Lredhat

Weaknesses

  • CWE-1286 Improper Validation of Syntactic Correctness of Input

Affected Products

ProductVersions
Red Hat Enterprise Linux 10Red Hat
    Red Hat Enterprise Linux 6Red Hat
      Red Hat Enterprise Linux 7Red Hat
        Red Hat Enterprise Linux 8Red Hat
          Red Hat Enterprise Linux 9Red Hat

            References

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