HTTP Header Handling Flaw in Libsoup Affects Request Processing
CVE-2025-14523

8.2HIGH

Key Information:

Vendor

Red Hat
Status
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
Vendor
CVE Published:
11 December 2025

What is CVE-2025-14523?

A vulnerability in libsoup's handling of HTTP headers permits multiple Host: headers within a single request. This may result in inconsistencies for server-side processing as it returns the last Host: header encountered. Consequently, common front proxies may disregard the last header, leading to vhost confusion. Such discrepancies can expose the system to various exploitations, including request-smuggling attacks, cache poisoning, and the circumvention of host-based access controls when an adversary injects duplicate Host headers.

Affected Version(s)

Red Hat Enterprise Linux 10 0:3.6.5-3.el10_1.8

Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.6.5-3.el10_0.11

Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.62.2-10.el7_9

References

https://access.redhat.com/errata/RHSA-2026:0421
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:0422
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:0423
vendor-advisoryx_refsource_REDHAT

CVSS V3.1

Score:
8.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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