Vulnerability in Red Hat Enterprise Linux 10

CVE-2026-66339

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 all…

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-66339?
CVE-2026-66339 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 6.5/10. Published 2026-07-24.
How severe is CVE-2026-66339?
Medium severity. CVSS v3 base score is 6.5 out of 10.