Libsoup: libsoup: duplicate host header handling causes host-parsing discrepancy (first- vs last-value wins)

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Summary

CVECVE-2025-14523
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-11 13:15:58 UTC
Updated2026-06-25 02:16:34 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from [email protected]

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

Problem Types: CWE-444 | CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
3.1CNACVSS8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 10 unaffected 0:3.6.5-3.el10_1.8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support unaffected 0:3.6.5-3.el10_0.11 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support unaffected 0:2.62.2-10.el7_9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:2.62.3-11.el8_10 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:8.10-6.el8_10.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:2.62.3-11.el8_10 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support unaffected 0:2.62.3-1.el8_2.7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support unaffected 0:8.10-6.el8_2.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 0:2.62.3-2.el8_4.7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 0:8.10-6.el8_4.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On unaffected 0:2.62.3-2.el8_4.7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On unaffected 0:8.10-6.el8_4.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unaffected 0:2.62.3-2.el8_6.7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unaffected 0:8.10-6.el8_6.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service unaffected 0:2.62.3-2.el8_6.7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service unaffected 0:8.10-6.el8_6.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions unaffected 0:2.62.3-2.el8_6.7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions unaffected 0:8.10-6.el8_6.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service unaffected 0:2.62.3-3.el8_8.7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service unaffected 0:8.10-6.el8_8.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions unaffected 0:2.62.3-3.el8_8.7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions unaffected 0:8.10-6.el8_8.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:2.72.0-12.el9_7.3 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions unaffected 0:2.72.0-8.el9_0.8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions unaffected 0:2.72.0-8.el9_2.8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support unaffected 0:2.72.0-8.el9_4.8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support unaffected 0:2.72.0-10.el9_6.5 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat In-Vehicle Operating System 1 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:1572 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:0908 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:1509 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:1571 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:0836 [email protected] access.redhat.com
access.redhat.com/security/cve/CVE-2025-14523 [email protected] access.redhat.com
gitlab.gnome.org/GNOME/libsoup/-/issues/472 [email protected] gitlab.gnome.org
access.redhat.com/errata/RHSA-2026:0422 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:0906 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:0905 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:0421 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:1569 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:0867 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:0909 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
access.redhat.com/errata/RHSA-2026:1570 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:0868 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:0911 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:0925 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:0423 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:0907 [email protected] access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Ky0toFu and Sovereign Tech Resilience program for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2025-12-11T06:58:04.938ZReported to Red Hat.
CNA2025-12-11T00:00:00.000ZMade public.

Workarounds

CNA: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

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