CVE-2026-66339

EUVD-2026-48751
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.5 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 15.3%
Affected Products (NVD)
VendorProductVersion
gnomelibsoup
-
redhatenterprise_linux
6.0
redhatenterprise_linux
7.0
redhatenterprise_linux
8.0
redhatenterprise_linux
9.0
redhatenterprise_linux
10.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
libsoup2.4
bookworm
no-dsa
trixie
no-dsa
libsoup3
bookworm
postponed
forky
vulnerable
sid
3.8.0-2
fixed
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
libsoup2.4
bionic
Fixed in 2.62.1-1ubuntu0.4+esm9
released
focal
Fixed in 2.70.0-1ubuntu0.5+esm4
released
jammy
Fixed in 2.74.2-3ubuntu0.9
released
noble
Fixed in 2.74.3-6ubuntu1.9
released
resolute
Fixed in 2.74.3-10.1ubuntu5+esm3
released
stonking
needed
xenial
Fixed in 2.52.2-1ubuntu0.3+esm8
released
libsoup3
jammy
Fixed in 3.0.7-0ubuntu1+esm9
released
noble
Fixed in 3.4.4-5ubuntu0.9
released
resolute
Fixed in 3.6.6-1ubuntu0.1
released
stonking
Fixed in 3.6.6-1ubuntu3
released
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
libsoup-2_4-1
suse enterprise desktop 15 SP7
2.74.3-150600.4.42.1
fixed
suse enterprise sap 12 SP5
2.62.2-5.49.1
fixed
suse enterprise sap 15 SP4
2.74.3-150400.3.43.1
fixed
suse enterprise sap 15 SP5
2.74.3-150400.3.43.1
fixed
suse enterprise sap 15 SP6
2.74.3-150600.4.42.1
fixed
suse enterprise sap 15 SP7
2.74.3-150600.4.42.1
fixed
suse enterprise server 12 SP3
2.62.2-5.49.1
fixed
suse enterprise server 12 SP5
2.62.2-5.49.1
fixed
suse enterprise server 15 SP4
2.74.3-150400.3.43.1
fixed
suse enterprise server 15 SP5
2.74.3-150400.3.43.1
fixed
suse enterprise server 15 SP6
2.74.3-150600.4.42.1
fixed
suse enterprise server 15 SP7
2.74.3-150600.4.42.1
fixed
libsoup-2_4-1-32bit
suse enterprise sap 12 SP5
2.62.2-5.49.1
fixed
suse enterprise server 12 SP3
2.62.2-5.49.1
fixed
suse enterprise server 12 SP5
2.62.2-5.49.1
fixed
libsoup-3_0-0
suse enterprise desktop 15 SP7
3.4.4-150600.3.56.1
fixed
suse enterprise sap 15 SP4
3.0.4-150400.3.52.1
fixed
suse enterprise sap 15 SP5
3.0.4-150400.3.52.1
fixed
suse enterprise sap 15 SP6
3.4.4-150600.3.56.1
fixed
suse enterprise sap 15 SP7
3.4.4-150600.3.56.1
fixed
suse enterprise server 15 SP4
3.0.4-150400.3.52.1
fixed
suse enterprise server 15 SP5
3.0.4-150400.3.52.1
fixed
suse enterprise server 15 SP6
3.4.4-150600.3.56.1
fixed
suse enterprise server 15 SP7
3.4.4-150600.3.56.1
fixed
libsoup-devel
suse enterprise desktop 15 SP7
3.4.4-150600.3.56.1
fixed
suse enterprise sap 12 SP5
2.62.2-5.49.1
fixed
suse enterprise sap 15 SP4
3.0.4-150400.3.52.1
fixed
suse enterprise sap 15 SP5
3.0.4-150400.3.52.1
fixed
suse enterprise sap 15 SP6
3.4.4-150600.3.56.1
fixed
suse enterprise sap 15 SP7
3.4.4-150600.3.56.1
fixed
suse enterprise server 12 SP3
2.62.2-5.49.1
fixed
suse enterprise server 12 SP5
2.62.2-5.49.1
fixed
suse enterprise server 15 SP4
3.0.4-150400.3.52.1
fixed
suse enterprise server 15 SP5
3.0.4-150400.3.52.1
fixed
suse enterprise server 15 SP6
3.4.4-150600.3.56.1
fixed
suse enterprise server 15 SP7
3.4.4-150600.3.56.1
fixed
libsoup-lang
suse enterprise desktop 15 SP7
3.4.4-150600.3.56.1
fixed
suse enterprise sap 12 SP5
2.62.2-5.49.1
fixed
suse enterprise sap 15 SP4
3.0.4-150400.3.52.1
fixed
suse enterprise sap 15 SP5
3.0.4-150400.3.52.1
fixed
suse enterprise sap 15 SP6
3.4.4-150600.3.56.1
fixed
suse enterprise sap 15 SP7
3.4.4-150600.3.56.1
fixed
suse enterprise server 12 SP3
2.62.2-5.49.1
fixed
suse enterprise server 12 SP5
2.62.2-5.49.1
fixed
suse enterprise server 15 SP4
3.0.4-150400.3.52.1
fixed
suse enterprise server 15 SP5
3.0.4-150400.3.52.1
fixed
suse enterprise server 15 SP6
3.4.4-150600.3.56.1
fixed
suse enterprise server 15 SP7
3.4.4-150600.3.56.1
fixed
libsoup2-devel
suse enterprise desktop 15 SP7
2.74.3-150600.4.42.1
fixed
suse enterprise sap 15 SP4
2.74.3-150400.3.43.1
fixed
suse enterprise sap 15 SP5
2.74.3-150400.3.43.1
fixed
suse enterprise sap 15 SP6
2.74.3-150600.4.42.1
fixed
suse enterprise sap 15 SP7
2.74.3-150600.4.42.1
fixed
suse enterprise server 15 SP4
2.74.3-150400.3.43.1
fixed
suse enterprise server 15 SP5
2.74.3-150400.3.43.1
fixed
suse enterprise server 15 SP6
2.74.3-150600.4.42.1
fixed
suse enterprise server 15 SP7
2.74.3-150600.4.42.1
fixed
libsoup2-lang
suse enterprise desktop 15 SP7
2.74.3-150600.4.42.1
fixed
suse enterprise sap 15 SP4
2.74.3-150400.3.43.1
fixed
suse enterprise sap 15 SP5
2.74.3-150400.3.43.1
fixed
suse enterprise sap 15 SP6
2.74.3-150600.4.42.1
fixed
suse enterprise sap 15 SP7
2.74.3-150600.4.42.1
fixed
suse enterprise server 15 SP4
2.74.3-150400.3.43.1
fixed
suse enterprise server 15 SP5
2.74.3-150400.3.43.1
fixed
suse enterprise server 15 SP6
2.74.3-150600.4.42.1
fixed
suse enterprise server 15 SP7
2.74.3-150600.4.42.1
fixed
typelib-1_0-Soup-2_4
suse enterprise desktop 15 SP7
2.74.3-150600.4.42.1
fixed
suse enterprise sap 12 SP5
2.62.2-5.49.1
fixed
suse enterprise sap 15 SP4
2.74.3-150400.3.43.1
fixed
suse enterprise sap 15 SP5
2.74.3-150400.3.43.1
fixed
suse enterprise sap 15 SP6
2.74.3-150600.4.42.1
fixed
suse enterprise sap 15 SP7
2.74.3-150600.4.42.1
fixed
suse enterprise server 12 SP3
2.62.2-5.49.1
fixed
suse enterprise server 12 SP5
2.62.2-5.49.1
fixed
suse enterprise server 15 SP4
2.74.3-150400.3.43.1
fixed
suse enterprise server 15 SP5
2.74.3-150400.3.43.1
fixed
suse enterprise server 15 SP6
2.74.3-150600.4.42.1
fixed
suse enterprise server 15 SP7
2.74.3-150600.4.42.1
fixed
typelib-1_0-Soup-3_0
suse enterprise desktop 15 SP7
3.4.4-150600.3.56.1
fixed
suse enterprise sap 15 SP4
3.0.4-150400.3.52.1
fixed
suse enterprise sap 15 SP5
3.0.4-150400.3.52.1
fixed
suse enterprise sap 15 SP6
3.4.4-150600.3.56.1
fixed
suse enterprise sap 15 SP7
3.4.4-150600.3.56.1
fixed
suse enterprise server 15 SP4
3.0.4-150400.3.52.1
fixed
suse enterprise server 15 SP5
3.0.4-150400.3.52.1
fixed
suse enterprise server 15 SP6
3.4.4-150600.3.56.1
fixed
suse enterprise server 15 SP7
3.4.4-150600.3.56.1
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
libsoup
Amazon Linux 2
0:2.56.0-6.amzn2.0.9
fixed
Amazon Linux 2023
0:2.72.0-6.amzn2023.0.15
fixed
libsoup-debuginfo
Amazon Linux 2
0:2.56.0-6.amzn2.0.9
fixed
Amazon Linux 2023
0:2.72.0-6.amzn2023.0.15
fixed
libsoup-debugsource
Amazon Linux 2023
0:2.72.0-6.amzn2023.0.15
fixed
libsoup-devel
Amazon Linux 2
0:2.56.0-6.amzn2.0.9
fixed
Amazon Linux 2023
0:2.72.0-6.amzn2023.0.15
fixed
libsoup-doc
Amazon Linux 2023
0:2.72.0-6.amzn2023.0.15
fixed
libsoup3
Amazon Linux 2023
0:3.7.2-1.amzn2023
fixed
libsoup3-debuginfo
Amazon Linux 2023
0:3.7.2-1.amzn2023
fixed
libsoup3-debugsource
Amazon Linux 2023
0:3.7.2-1.amzn2023
fixed
libsoup3-devel
Amazon Linux 2023
0:3.7.2-1.amzn2023
fixed
libsoup3-doc
Amazon Linux 2023
0:3.7.2-1.amzn2023
fixed
Common Weakness Enumeration
References
https://access.redhat.com/security/cve/CVE-2026-66339
https://bugzilla.redhat.com/show_bug.cgi?id=2506951