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Δ / VULNERABILITY RECORD

CVE-2025-9901.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSMEDIUM / 5.9No severity score in this snapshot.
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSMicrosoft vendor recordModified Oct 02, 2026

Disclosure summary

Libsoup: improper handling of http vary header in libsoup caching

Source-reported weakness categories

CWE-524

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

Microsoft Security Updates (CVRF) · 2025-Sep

Open original source · Updated Oct 02, 2026

Libsoup: improper handling of http vary header in libsoup caching

Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.

Microsoft maximum product score: 5.9

VendorProduct / associationVersion / bounds
Microsoft update guideazl3 libsoup 3.4.4-9 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 libsoup 3.0.4-7 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guidecbl2 libsoup 3.0.4-9 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guideazl3 libsoup 3.4.4-10 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guideazl3 libsoup 3.4.4-12 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guideazl3 libsoup 3.4.4-14 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 libsoup 3.0.4-13 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guideazl3 libsoup 3.4.4-16 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 libsoup 3.0.4-10 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guideazl3 libsoup 3.4.4-11 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 libsoup 3.0.4-12 on CBL Mariner 2.0 (MSRC status code 3)
Microsoft update guideazl3 libsoup 3.4.4-15 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 libsoup 3.0.4-13 (MSRC status code 3)
Microsoft update guideazl3 libsoup 3.4.4-17 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 libsoup 3.0.4-13 on CBL-Mariner 2.0 (MSRC status code 3)

Vendor remediation references

  • Release Notes · product IDs 21478-17084, 21895-17084, 21115-21692
  • Vendor guidance · product IDs 21478-17084, 21895-17084, 21115-21692

Original records & references

PUBLISHED 2025-09-06T21:17:16-04:00
MODIFIED 2026-10-02T21:55:56-04:00
INGESTED 2026-10-08T12:45:42-04:00