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 6
Red Hat Enterprise Linux 7
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.

References

https://access.redhat.com/security/cve/CVE-2025-14523
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2421349
issue-trackingx_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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