Vulnerability in Red Hat Enterprise Linux 10
CVE-2025-14523
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.
Vulnerability class: HTTP Request Smuggling
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (43.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.005 · change: -0.000
Affected products
- Red Hat Enterprise Linux 10 — versions 0:3.6.5-3.el10_1.8
- Red Hat Enterprise Linux 10.0 Extended Update Support — versions 0:3.6.5-3.el10_0.11
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7 Extended Lifecycle Support — versions 0:2.62.2-10.el7_9
- Red Hat Enterprise Linux 8 — versions 0:2.62.3-11.el8_10, 0:8.10-6.el8_10.1
- Red Hat Enterprise Linux 8.2 Advanced Update Support — versions 0:2.62.3-1.el8_2.7, 0:8.10-6.el8_2.1
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support — versions 0:2.62.3-2.el8_4.7, 0:8.10-6.el8_4.1
- Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On — versions 0:2.62.3-2.el8_4.7, 0:8.10-6.el8_4.1
- Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support — versions 0:2.62.3-2.el8_6.7, 0:8.10-6.el8_6.1
- Red Hat Enterprise Linux 8.6 Telecommunications Update Service — versions 0:2.62.3-2.el8_6.7, 0:8.10-6.el8_6.1
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2026:0421 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:0422 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:0423 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:0836 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:0867 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:0868 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:0905 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:0906 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:0907 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:0908 (vendor-advisory)
Frequently asked questions
- What is CVE-2025-14523?
- CVE-2025-14523 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 8.2/10. Published 2025-12-11.
- How severe is CVE-2025-14523?
- High severity. CVSS v3 base score is 8.2 out of 10.