Vulnerability record/PUBLISHED/Published Apr 23, 2026 21:51:23 UTC

CVE-2026-2708

A request smuggling vulnerability exists in libsoup's HTTP/1 header parsing logic. The soup_message_headers_append_common() function in libsoup/soup-message-headers.c unconditionally appends each header value without validating for duplicate or conflicting Content-Length fields. This allows an attacker to send HTTP requests containing multiple Content-Length headers with differing values.

Base score3.7/ 10

SeverityLowCVSS 3.1

Exploitability / impact

CVSS metric breakdown

Vector-derived attributes

Base severityLow

Attack vectorNetworkAV

Attack complexityHighAC

Privileges requiredNonePR

User interactionNoneUI

ScopeUnchangedS

Confidentiality impactNoneC

Integrity impactLowI

Availability impactNoneA

CVSS vector stringCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.

Record context

CVE Numbering Authorityredhat

Last updatedNov 6, 2026 18:23:22 UTC

PublishedApr 23, 2026 21:51:23 UTC

ReservedFeb 18, 2026 19:54:50 UTC

Credits

Red Hat would like to thank Cavid for reporting this issue.