Description
A flaw in libsoup’s HTTP header handling allows multiple Host: headers in a request and returns the last occurrence for server-side processing. Common front proxies often honor the first Host: header, so this mismatch can cause vhost confusion where a proxy routes a request to one backend but the backend interprets it as destined for another host. This discrepancy enables request-smuggling style attacks, cache poisoning, or bypassing host-based access controls when an attacker supplies duplicate Host headers.
References (21)
... and 1 more
Scores
CVSS v3
8.2
EPSS
0.0002
EPSS Percentile
5.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-444
Status
published
Products (27)
Red Hat/Red Hat Enterprise Linux 10
0:3.6.5-3.el10_1.8
Red Hat/Red Hat Enterprise Linux 10.0 Extended Update Support
0:3.6.5-3.el10_0.11
Red Hat/Red Hat Enterprise Linux 6
Red Hat/Red Hat Enterprise Linux 7 Extended Lifecycle Support
0:2.62.2-10.el7_9
Red Hat/Red Hat Enterprise Linux 8
0:2.62.3-11.el8_10
Red Hat/Red Hat Enterprise Linux 8
0:8.10-6.el8_10.1
Red Hat/Red Hat Enterprise Linux 8.2 Advanced Update Support
0:2.62.3-1.el8_2.7
Red Hat/Red Hat Enterprise Linux 8.2 Advanced Update Support
0:8.10-6.el8_2.1
Red Hat/Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
0:2.62.3-2.el8_4.7
Red Hat/Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
0:8.10-6.el8_4.1
... and 17 more
Published
Dec 11, 2025
Tracked Since
Feb 18, 2026