Libsoup: libsoup: duplicate host header handling causes host-parsing discrepancy (first- vs last-value wins)

8.2 CVSS

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Red Hat would like to thank Ky0toFu and Sovereign Tech Resilience program for reporting this issue.

References

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Affected Vendor

Red Hat

View all reports →

Affected Software

Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8.2 Advanced Update Support, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On, Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Telecommunications Update Service, Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions, Red Hat Enterprise Linux 8.8 Telecommunications Update Service, Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.4 Extended Update Support, Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat Enterprise Linux 6

Vulnerable Versions:

0:3.6.5-3.el10_1.8, 0:3.6.5-3.el10_0.11, 0:2.62.2-10.el7_9, 0:2.62.3-11.el8_10, 0:8.10-6.el8_10.1, 0:2.62.3-1.el8_2.7, 0:8.10-6.el8_2.1, 0:2.62.3-2.el8_4.7, 0:8.10-6.el8_4.1, 0:2.62.3-2.el8_6.7, 0:8.10-6.el8_6.1, 0:2.62.3-3.el8_8.7, 0:8.10-6.el8_8.1, 0:2.72.0-12.el9_7.3, 0:2.72.0-8.el9_0.8, 0:2.72.0-8.el9_2.8, 0:2.72.0-8.el9_4.8, 0:2.72.0-10.el9_6.5