CVE-2026-5119
Libsoup: libsoup: information disclosure via cleartext transmission of cookies during https tunnel establishment
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
4th
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.
| CWE | CWE-319 |
| Vendor | red hat |
| Product | red hat enterprise linux 10 |
| Published | Mar 30, 2026 |
| Last Updated | Jun 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None
Affected Versions
Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:13978 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:14087 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:15968 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:17482 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:19143 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:19356 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:21686 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:22316 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:22317 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:22323 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:22710 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:22716 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:24344 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:24722 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-5119 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2452932 gitlab.gnome.org: https://gitlab.gnome.org/GNOME/libsoup/-/issues/502
Credits
Red Hat would like to thank Kona Arctic for reporting this issue.