CVE-2026-66339

MediumCVSS 6.5/10Last modified Nov 5, 2026

Description

A flaw was found in libsoup. After a CONNECT tunnel is established through an HTTP proxy, libsoup incorrectly attaches the Proxy-Authorization header to subsequent HTTPS requests sent through that tunnel to the destination server. This allows the destination server to capture proxy credentials, leading to information disclosure.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-201

Affected software

Vendor	Product	Versions
Red Hat	Red Hat Enterprise Linux 10	—
Red Hat	Red Hat Enterprise Linux 6	—
Red Hat	Red Hat Enterprise Linux 7	—
Red Hat	Red Hat Enterprise Linux 8	—
Red Hat	Red Hat Enterprise Linux 9	—

References

https://access.redhat.com/security/cve/CVE-2026-66339Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2506951Exploit, Issue Tracking, Mitigation, Vendor Advisory

Timeline

Published: Jul 24, 2026
Last modified: Nov 5, 2026
NVD status: Analyzed

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