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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.

PUBLISHED Reserved 2025-12-11 | Published 2025-12-11 | Updated 2025-12-11 | Assigner redhat




HIGH: 8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Problem types

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Product status

Default status
affected

Default status
unknown

Default status
affected

Default status
affected

Default status
affected

Timeline

2025-12-11:Reported to Red Hat.
2025-12-11:Made public.

Credits

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

References

access.redhat.com/security/cve/CVE-2025-14523 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2421349 (RHBZ#2421349) issue-tracking

cve.org (CVE-2025-14523)

nvd.nist.gov (CVE-2025-14523)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.