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Vulnerability details

CVE-2025-14523

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

CVSS 3.1
8.2High

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.

CVSS scores

ScoreVersionSourceVector
8.2High 3.1 CVEProject cvelistV5 (CNA) (redhat) CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Affected products

VendorProductVersionsSource
No product information recorded.

References and advisories

21
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Details

Published
2025-12-11
Last updated
2026-11-05
State
Published
Assigner (CNA)
redhat

Exploit prediction (EPSS)

0.54%
Probability of exploitation in 30 days
45.8%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
Yes
Exploitation
None
Technical impact
Partial

Weaknesses (CWE)

  • CWE-444
    Inconsistent Interpretation of HTTP Requests