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Vulnerability · Published Dec 11, 2025 · Assigned by redhat

CVE-2025-14523Libsoup: libsoup: duplicate host header handling causes host-parsing discrepancy (first- vs last-value wins)

High 8.2

In plain English

A high-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.2High
Exploit odds (30 days)0.5%top 54.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8libsoup2.62.3-11.el8_10ALSA-2026:0421
AlmaLinux:9libsoup2.72.0-12.el9_7.3ALSA-2026:0422
AlmaLinux:8libsoup-devel2.62.3-11.el8_10ALSA-2026:0421
AlmaLinux:9libsoup-devel2.72.0-12.el9_7.3ALSA-2026:0422
AlmaLinux:10libsoup3-doc3.6.5-3.el10_1.8ALSA-2026:0423
Debian:12libsoup2.4no fix listedDEBIAN-CVE-2025-14523
Debian:13libsoup2.4no fix listedDEBIAN-CVE-2025-14523
Debian:12libsoup3no fix listedDEBIAN-CVE-2025-14523
Debian:13libsoup3no fix listedDEBIAN-CVE-2025-14523
Rocky Linux:8libsoup0:2.62.3-11.el8_10RLSA-2026:0421
Rocky Linux:9libsoup0:2.72.0-12.el9_7.3RLSA-2026:0422
Rocky Linux:10libsoup30:3.6.5-3.el10_1.8RLSA-2026:0423
Rocky Linux:8spice-client-win0:8.10-6.el8_10.1RLSA-2026:1509
Ubuntu:22.04:LTSlibsoup2.4no fix listedUBUNTU-CVE-2025-14523
Ubuntu:24.04:LTSlibsoup2.4no fix listedUBUNTU-CVE-2025-14523
Ubuntu:25.10libsoup2.4no fix listedUBUNTU-CVE-2025-14523
Ubuntu:26.10libsoup2.4no fix listedUBUNTU-CVE-2025-14523
Ubuntu:24.04:LTSlibsoup3no fix listedUBUNTU-CVE-2025-14523
Ubuntu:25.10libsoup3no fix listedUBUNTU-CVE-2025-14523

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support see references
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 6 see references

Weakness: CWE-444 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

References