Host-based control bypass via duplicate Host headers
Published Dec 11, 2025 · Updated Dec 11, 2025
HTTP request smuggling in libsoup on Red Hat Enterprise Linux allows remote attackers to bypass host-based controls via duplicate Host headers. The soup_message_headers_get_one_common path accepts repeated Host fields and uses the last value to construct the request URI instead of rejecting the request. Exploitation requires a front proxy that routes on the first Host value; the disagreement enables virtual-host confusion, cache poisoning, or host-based access-control bypass.
Summary
What happened
HTTP request smuggling in libsoup on Red Hat Enterprise Linux allows remote attackers to bypass host-based controls via duplicate Host headers. The soup_message_headers_get_one_common path accepts repeated Host fields and uses the last value to construct the request URI instead of rejecting the request. Exploitation requires a front proxy that routes on the first Host value; the disagreement enables virtual-host confusion, cache poisoning, or host-based access-control bypass.
The record
- CVE
- CVE-2025-14523
- Published
- Dec 11, 2025
- Updated
- Dec 11, 2025
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux 10
- Classifications
- CWE-444, CAPEC-33, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 11, 2025CVE publishedPublication date reported by the CVE source.
- Dec 11, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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