Vulnerability Report

CVE-2026-5119

Title: libsoup HTTPS Tunnel Session Cookie Cleartext Transmission

Information Disclosure

Proof Of Concept

No public PoC currently indexed for CVE-2026-5119.

CWE Category CWE-319

Published Date Mar 30, 2026

Modified Date Jun 03, 2026

Exploit Status Not Found

Score 5.9 CVSS v3.1

Exploit Probability (EPSS)

0.02%

Vulnerability Summary

CVE-2026-5119: A flaw was found in libsoup. When establishing HTTPS tunnels through a configured HTTP proxy, sensitive session cookies are transmitted in cleartext within the initial HTTP CONNECT request. A network-positioned attacker or a malicious HTTP proxy can intercept these cookies, leading to potential session hijacking or user impersonation.

Impacted Vendors

Reference Links

https://access.redhat.com/security/cve/CVE-2026-5119 https://bugzilla.redhat.com/show_bug.cgi?id=2452932 https://gitlab.gnome.org/GNOME/libsoup/-/issues/502

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.9

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

CVSS v3.1

Source Entity [email protected]

Severity HIGH

8.2

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-5119 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

June 03, 2026 MODIFIED

Vulnerability data updated via NVD.

June 03, 2026 MODIFIED

Vulnerability data updated via NVD.

June 03, 2026 MODIFIED

Vulnerability data updated via NVD.

June 01, 2026 MODIFIED

Vulnerability data updated via NVD.

June 01, 2026 MODIFIED

Vulnerability data updated via NVD.

June 01, 2026 MODIFIED

Vulnerability data updated via NVD.

May 28, 2026 MODIFIED

Vulnerability data updated via NVD.

May 19, 2026 MODIFIED

Vulnerability data updated via NVD.

May 14, 2026 MODIFIED

Vulnerability data updated via NVD.

May 11, 2026 MODIFIED

Vulnerability data updated via NVD.

May 06, 2026 MODIFIED

Vulnerability data updated via NVD.

March 30, 2026 MODIFIED

Vulnerability data updated via NVD.

March 30, 2026 MODIFIED

Vulnerability data updated via NVD.

March 30, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity HIGH

Privileges N/A

Interaction REQUIRED

CVSS Vector String


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

Affected Stack

No specific products linked.