Bug 2452932 (CVE-2026-5119)

Summary: CVE-2026-5119 libsoup: libsoup: Information disclosure via cleartext transmission of cookies during HTTPS tunnel establishment
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: security-response-team
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
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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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2452934, 2452935, 2452936    
Bug Blocks:    

Description OSIDB Bzimport 2026-03-30 05:15:51 UTC
Cleartext Transmission of Sensitive Information has been reported in libsoup’s HTTP CONNECT handling. When establishing HTTPS tunnels via soup_session.c::tunnel_connect(), cookies (including potentially sensitive session cookies) are sent in cleartext within the initial HTTP CONNECT request to the configured proxy. A network-positioned attacker or malicious HTTP proxy can intercept or observe these cookies and leverage them for session hijacking or user impersonation.