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This CVE record has been marked for NVD enrichment efforts.
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.
Metrics
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CVE Modified by Red Hat, Inc.1/29/2026 11:16:07 AM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:1569
Added
Reference
https://access.redhat.com/errata/RHSA-2026:1572
CVE Modified by Red Hat, Inc.1/29/2026 7:16:29 AM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:1570
Added
Reference
https://access.redhat.com/errata/RHSA-2026:1571
CVE Modified by Red Hat, Inc.1/28/2026 3:16:08 PM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:1509
CVE Modified by Red Hat, Inc.1/21/2026 11:16:05 AM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:0925
CVE Modified by Red Hat, Inc.1/21/2026 5:15:49 AM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:0908
Added
Reference
https://access.redhat.com/errata/RHSA-2026:0909
Added
Reference
https://access.redhat.com/errata/RHSA-2026:0911
CVE Modified by Red Hat, Inc.1/21/2026 1:15:46 AM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:0905
Added
Reference
https://access.redhat.com/errata/RHSA-2026:0906
Added
Reference
https://access.redhat.com/errata/RHSA-2026:0907
CVE Modified by Red Hat, Inc.1/20/2026 11:16:01 AM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:0867
Added
Reference
https://access.redhat.com/errata/RHSA-2026:0868
CVE Modified by Red Hat, Inc.1/20/2026 5:16:05 AM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:0836
CVE Modified by Red Hat, Inc.1/11/2026 10:16:06 PM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:0421
Added
Reference
https://access.redhat.com/errata/RHSA-2026:0422
Added
Reference
https://access.redhat.com/errata/RHSA-2026:0423
New CVE Received from Red Hat, Inc.12/11/2025 8:15:58 AM
Action
Type
Old Value
New Value
Added
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.