CVE-2026-66339
🔶 mediumSummary
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.
CVSS Score
6.5
Medium
EPSS Score
0.2
Exploit Probability
Published Date
2026-07-24
First Seen: 2026-07-31
📊 Relative Risk Intelligence
This CVE is Lower Risk - more severe than 47.4% of all 340,405 vulnerabilities in our database.
#179,012
Below average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: Jul 28, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Partial
Limited system impact
🏆 Discovered By
Upstream acknowledges cavid as the original reporter.
SSVC data provided by
CISA
Last Modified
2026-07-28
Source
NVD 🔗
CVSS Vector 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CWE IDs (Weakness Types)