CVE-2026-66338

Published: Jul 24, 2026Modified: Aug 24, 2026

7.2

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Exploitability: 3.9 / Impact: 2.7

Source: NVD

Description

A flaw was found in libsoup. The chunked transfer encoding parser uses a permissive parsing function for chunk sizes that silently accepts inputs violating RFC 9112, including leading whitespace, plus sign prefixes, and trailing invalid characters. When libsoup operates behind a strict frontend proxy, this parsing differential can be exploited to smuggle HTTP requests.

Affected (6)

Products: Gnome: Libsoup · Redhat: Enterprise Linux

1 product

1 product

Configuration A

6 vulnerable

Vulnerable Software	Affected Versions
Gnome Libsoup	All versions
Redhat Enterprise Linux	Version 10.0
Redhat Enterprise Linux	Version 6.0
Redhat Enterprise Linux	Version 7.0
Redhat Enterprise Linux	Version 8.0
Redhat Enterprise Linux	Version 9.0

Related CWEs

CWE-444

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

References (2)

https://access.redhat.com/security/cve/CVE-2026-66338

Source: secalert@redhat.com

Vendor Advisory

https://bugzilla.redhat.com/show_bug.cgi?id=2506950

Source: secalert@redhat.com

ExploitIssue TrackingVendor Advisory

Timeline

No history available yet.