Summary
Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: 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.
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2 | libsoup | 0:2.56.0-6.amzn2.0.7 |
| Amazon Linux · 2 | libsoup-debuginfo | 0:2.56.0-6.amzn2.0.7 |
| Amazon Linux · 2 | libsoup-devel | 0:2.56.0-6.amzn2.0.7 |
Vulnerabilities 1
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High 8.2
Libsoup: libsoup: duplicate host header handling causes host-parsing discrepancy (first- vs last-value wins)
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 r…
References
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web
https://alas.aws.amazon.com/cve/html/CVE-2025-14523.html