CVE-2025-9901 - CVE House
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Status published Medium CVE-2025-9901

Libsoup: improper handling of http vary header in libsoup caching

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Red Hat would like to thank zkbytes for reporting this issue.

References

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Affected Vendor

Affected Software

Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9
Vulnerable Versions:
Unknown

Timeline

Official Publish: September 3rd, 2025
Last Modified: June 30th, 2026
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Weaknesses (CWE)

CWE-524

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.