CVE-2026-3634

Libsoup: libsoup: http header injection and response splitting via crlf injection in content-type header

MEDIUM
6.5
CVSS Score
Published: March 17, 2026 at 09:44 AM UTC
Updated: June 17, 2026 at 10:43 AM UTC
2 products affected across 2 vendorsEnterprise LinuxLibsoup

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.2%
SSVC
PoC

Description

A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the `soup_message_headers_set_content_type()` function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
Vendor states this is fixed in 6 (unknown)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (3)

VDB Entryx_refsource_REDHATVendor Advisory
Source: cverecord
https://access.redhat.com/security/cve/CVE-2026-3634
Issue Trackingx_refsource_REDHATVendor Advisory
Source: cverecord
https://bugzilla.redhat.com/show_bug.cgi?id=2445129
ExploitIssue TrackingVendor Advisory
Source: cverecord
https://gitlab.gnome.org/GNOME/libsoup/-/issues/485

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-93

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