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Libsoup CVE-2026-66339

| EUVDEUVD-2026-48751 MEDIUM
Insertion of Sensitive Information Into Sent Data (CWE-201)
2026-07-24 secalert@redhat.com GHSA-vh9q-f797-xwg7
6.5
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
SUSE
MEDIUM
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

1
Analysis Generated
Jul 26, 2026 - 12:10 vuln.today

DescriptionCVE.org

A flaw was found in libsoup. After a CONNECT tunnel is established through an HTTP proxy, libsoup incorrectly attaches the Proxy-Authorization header to subsequent HTTPS requests sent through that tunnel to the destination server. This allows the destination server to capture proxy credentials, leading to information disclosure.

AnalysisAI

libsoup leaks proxy credentials to destination servers via Proxy-Authorization header attachment after CONNECT tunnel establishment. Affects libsoup when used with HTTP proxies for HTTPS tunneling. No public exploit is known, and exploitation probability is low (EPSS 0.23%).

CVE-2019-17266 CRITICAL POC
9.8 Oct 06

libsoup from versions 2.65.1 until 2.68.1 have a heap-based buffer over-read because soup_ntlm_parse_challenge() in soup

CVE-2024-52530 HIGH POC
7.5 Nov 11

GNOME libsoup before 3.6.0 allows HTTP request smuggling in some configurations because '\0' characters at the end of he

CVE-2025-2784 MEDIUM POC
6.5 Apr 03

A flaw was found in libsoup. Rated high severity (CVSS 7.0), this vulnerability is remotely exploitable, no authenticati

CVE-2024-52531 MEDIUM POC
6.5 Nov 11

GNOME libsoup before 3.6.1 allows a buffer overflow in applications that perform conversion to UTF-8 in soup_header_pars

CVE-2018-12910 CRITICAL
9.8 Jul 05

The get_cookies function in soup-cookie-jar.c in libsoup 2.63.2 allows attackers to have unspecified impact via an empty

CVE-2024-52532 HIGH
7.5 Nov 11

GNOME libsoup before 3.6.1 has an infinite loop, and memory consumption. Rated high severity (CVSS 7.5), this vulnerabil

CVE-2026-66338 HIGH
7.2 Jul 24

HTTP request smuggling in libsoup (GNOME's HTTP client/server library) enables network-accessible attackers to inject hi

CVE-2026-66337 MEDIUM
6.5 Jul 24

Heap buffer over-read in libsoup's multipart response parser allows remote, unauthenticated attackers to crash client ap

CVE-2026-2369 MEDIUM
6.5 Mar 19

libsoup versions prior to the patched release contain an integer underflow vulnerability in zero-length resource process

CVE-2018-11713 MEDIUM
6.5 Jun 04

WebCore/platform/network/soup/SocketStreamHandleImplSoup.cpp in the libsoup network backend of WebKit, as used in WebKit

CVE-2012-2132 MEDIUM
5.0 Aug 20

libsoup 2.32.2 and earlier does not validate certificates or clear the trust flag when the ssl-ca-file does not exist, w

CVE-2026-12548 MEDIUM
4.2 Jul 21

Heap out-of-bounds read in libsoup's multipart HTTP message parser allows remote attackers to crash affected application

Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Micro 5.3 Affected

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CVE-2026-66339 vulnerability details – vuln.today

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