CVE-2026-12547

EUVD-2026-46361
SoupAuthManager caches proxy authentication credentials without scoping them to the proxy authority (host:port). When the proxy configuration changes (e.g., via system settings or WPAD), cached Proxy-Authorization headers from the previous proxy are sent to the new proxy, leaking credentials.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
3.4 LOW
NETWORK
LOW
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:N/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 13.38%
Debian logo
Debian Releases
Debian Product
Codename
libsoup2.4
bookworm
vulnerable
bullseye
vulnerable
bullseye (security)
vulnerable
trixie
no-dsa
libsoup3
bookworm
vulnerable
forky
vulnerable
sid
vulnerable
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
libsoup2.4
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
xenial
needs-triage
libsoup3
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
Common Weakness Enumeration
References
https://access.redhat.com/security/cve/CVE-2026-12547
https://bugzilla.redhat.com/show_bug.cgi?id=2489994
https://gitlab.gnome.org/GNOME/libsoup/-/work_items/506