CVE-2025-9901 — Libsoup: improper handling of http vary header in libsoup caching
A flaw was found in libsoup’s caching mechanism, SoupCache, where the HTTP Vary header is ignored when evaluating cached responses. This header ensures that responses vary appro…
Published: 2025-09-03 · CVSS: 5.9 · CVSS 3.1
A flaw was found in libsoup’s caching mechanism, SoupCache, where the HTTP Vary header is ignored when evaluating cached responses. This header ensures that responses vary appropriately based on request headers such as language or authentication. Without this check, cached content can be incorrectly reused across different requests, potentially exposing sensitive user information. While the issue is unlikely to affect everyday desktop use, it could result in confidentiality breaches in proxy or multi-user environments.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7