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.

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Fixes

Solution

No solution given by the vendor.


Workaround

To mitigate this issue, ensure that all HTTP proxies used for HTTPS tunnels are trusted and operate within a secure network. Avoid configuring applications to use untrusted HTTP proxies. If feasible, configure applications to bypass proxies for sensitive connections or utilize a secure proxy solution that encrypts the entire communication channel. A service restart or application reload may be required for changes to take effect.

History

Mon, 30 Mar 2026 06:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Libsoup: libsoup: information disclosure via cleartext transmission of cookies during https tunnel establishment
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-319
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-03-30T05:35:57.099Z

Reserved: 2026-03-30T05:13:41.920Z

Link: CVE-2026-5119

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-30T07:15:58.350

Modified: 2026-03-30T07:15:58.350

Link: CVE-2026-5119

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-30T07:59:09Z

Weaknesses