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Vulnerabilities

Vulnerability · 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.

Published Dec 11, 2025 · catalog updated Jun 29, 2026 · Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-14523. EPSS is 0.54%. Act only if a listed version of Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.54%
Remediation
Vendor / distro source
Affected products
vendor Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support patch: 0:8.10-6.el8_4.1

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support patch: 0:8.10-6.el8_4.1patch: 0:8.10-6.el8_4.1

How to fix CVE-2025-14523

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-14523. EPSS is 0.54%. Act only if a listed version of Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support is installed.

Which versions are affected?

Compare what you have installed with Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support patch: 0:8.10-6.el8_4.1 patch: 0:8.10-6.el8_4.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.54%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 11, 2025 · EUVD

    Detected

    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 a

  2. Jun 29, 2026 · EUVD

    Updated

    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 a

Sources

  • CVE.orgVulnerability recordCVE-2025-14523

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-14523

    30-day exploitation probability 0.54%

    first.org
  • EUVDVulnerability recordEUVD-2025-202685

    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 on

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 1, 2026
  • CVE.orgOct 26, 2026
  • EUVDOct 26, 2026