CVE-2025-9901

Summary

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.

Affected Software

VendorProductVersion RangeStatus

Weaknesses

  • CWE-524: Use of Cache Containing Sensitive Information

Workarounds

Mitigation for this issue is either not available or the currently available options do not meet Red Hat Product Security criteria comprising ease of use, deployment applicability to widespread installations, or stability. Administrators should apply vendor-supplied patches once they become available.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References