CVE-2026-5119
Libsoup: libsoup: information disclosure via cleartext transmission of cookies during https tunnel establishment
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.
INFO
Published Date :
March 30, 2026, 7:15 a.m.
Last Modified :
April 1, 2026, 5:45 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 53f830b8-0a3f-465b-8143-3b8a9948e749 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update libsoup to the latest version.
- Configure HTTP proxy settings securely.
- Avoid sending sensitive cookies over HTTP.
- Review proxy configurations for vulnerabilities.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-5119.
| URL | Resource |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-5119 | Vendor Advisory Mitigation |
| https://bugzilla.redhat.com/show_bug.cgi?id=2452932 | Issue Tracking Vendor Advisory |
| https://gitlab.gnome.org/GNOME/libsoup/-/issues/502 | Exploit Issue Tracking |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-5119 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-5119
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-5119 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-5119 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 01, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N Added CPE Configuration OR *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:a:gnome:libsoup:-:*:*:*:*:*:*:* Added Reference Type Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-5119 Types: Mitigation, Vendor Advisory Added Reference Type Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2452932 Types: Issue Tracking, Vendor Advisory Added Reference Type Red Hat, Inc.: https://gitlab.gnome.org/GNOME/libsoup/-/issues/502 Types: Exploit, Issue Tracking -
New CVE Received by [email protected]
Mar. 30, 2026
Action Type Old Value New Value 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N Added CWE CWE-319 Added Reference https://access.redhat.com/security/cve/CVE-2026-5119 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2452932 Added Reference https://gitlab.gnome.org/GNOME/libsoup/-/issues/502