CVE-2026-66339
mediumA flaw was found in libsoup.
Vendor / product: Gnome — libsoup
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
6.5
6.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Severity source: NVD CVSS v3.1 (secalert@redhat.com)
Timeline (UTC)
Published: 2026-07-24 23:16
Modified: 2026-11-05 23:16
NVD status: Analyzed
Last synced 43 minutes ago
Verified against the source API 2026-11-05 23:24 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
gnome / libsoup all versions
redhat / enterprise_linux 6.0, 7.0, 8.0, 9.0, 10.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://access.redhat.com/security/cve/CVE-2026-66339
Vendor advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2506951
Patch / mitigation: https://bugzilla.redhat.com/show_bug.cgi?id=2506951
References
- https://access.redhat.com/security/cve/CVE-2026-66339 secalert@redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2506951 secalert@redhat.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-05 23:24 UTC · record ↗