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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.

PUBLISHED Reserved 2026-03-06 | Published 2026-03-17 | Updated 2026-03-19 | Assigner redhat




LOW: 3.9CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L

Problem types

Improper Validation of Syntactic Correctness of Input

Product status

Default status
affected

Default status
unknown

Default status
affected

Default status
affected

Default status
affected

Timeline

2026-03-06:Reported to Red Hat.
2026-03-06:Made public.

Credits

Red Hat would like to thank Codean Labs for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-3632 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2445127 (RHBZ#2445127) issue-tracking

gitlab.gnome.org/GNOME/libsoup/-/issues/483

cve.org (CVE-2026-3632)

nvd.nist.gov (CVE-2026-3632)

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