VulnerabilityAnalyzed
CVE-2026-66339
This allows the destination server to capture proxy credentials, leading to information disclosure.
MEDIUM 6.5EPSS 0.23%
Does this matter?
Lower severity and a low EPSS score (0.23%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- EPSS
- 0.23% probability · 13th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-201
- Affected
- gnome/libsoup · redhat/enterprise linux
- Source
- secalert@redhat.com
References
- https://access.redhat.com/security/cve/CVE-2026-66339Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2506951Issue Tracking, Vendor Advisory, Exploit, Mitigation
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.