CVE-2025-9901MediumMicrosoft CVSS 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P

Microsoft security update for CVE-2025-9901

Published
June 3, 2026
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2025-9901 →

📋 Microsoft's advisory

EchelonGraph does not copy Microsoft's advisory page: its FAQ and remediation text are not shown here. Read the advisory on https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-9901. This page also shows what EchelonGraph holds for CVE-2025-9901, with the description from its CVE record, which the CVE Numbering Authority that assigned the CVE wrote: for a CVE Microsoft assigned, often in the words of Microsoft's own advisory.

🎯 Affected products16

  • azl3 libsoup 3.4.4-10 on Azure Linux 3.0
  • azl3 libsoup 3.4.4-11 on Azure Linux 3.0
  • azl3 libsoup 3.4.4-12 on Azure Linux 3.0
  • azl3 libsoup 3.4.4-14 on Azure Linux 3.0
  • azl3 libsoup 3.4.4-15 on Azure Linux 3.0
  • azl3 libsoup 3.4.4-16 on Azure Linux 3.0
  • azl3 libsoup 3.4.4-17 on Azure Linux 3.0
  • azl3 libsoup 3.4.4-18 on Azure Linux 3.0
  • azl3 libsoup 3.4.4-9 on Azure Linux 3.0
  • cbl2 libsoup 3.0.4-10 on CBL Mariner 2.0
  • cbl2 libsoup 3.0.4-12 on CBL Mariner 2.0
  • cbl2 libsoup 3.0.4-13
  • cbl2 libsoup 3.0.4-13 on CBL Mariner 2.0
  • cbl2 libsoup 3.0.4-13 on CBL-Mariner 2.0
  • cbl2 libsoup 3.0.4-7 on CBL Mariner 2.0
  • cbl2 libsoup 3.0.4-9 on CBL Mariner 2.0

✅ Updates Microsoft lists: 1 update

1 row: one per KB article or update, update type and fixed build. Their details are on Microsoft's advisory.

KB articleUpdateFixed build
—Security Update—

🧭 EchelonGraph on CVE-2025-9901

EchelonGraph score
5.9 MEDIUM
CISA KEV
Not listed
Fix status
A fix is available — apply it.

Description from the CVE record (CVE.org), as published by its numbering authority

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.

Published by Red Hat, Inc., the CVE Numbering Authority that assigned CVE-2025-9901, in its CVE record at CVE.org; reused under the CVE Program's Terms of Use (its licence and MITRE's copyright notice are in our Terms of Service).

🔗 References (2)