Description
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.
Problem types
Use of Cache Containing Sensitive Information
Product status
Timeline
| 2025-09-03: | Reported to Red Hat. |
| 2025-09-03: | Made public. |
Credits
Red Hat would like to thank zkbytes for reporting this issue.
References
access.redhat.com/security/cve/CVE-2025-9901
bugzilla.redhat.com/show_bug.cgi?id=2392790 (RHBZ#2392790)
