Microsoft security update for CVE-2026-3644
🔗 CVE IDs covered (1)
📋 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-2026-3644. This page also shows what EchelonGraph holds for CVE-2026-3644, 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 products9
- azl3 python3 3.12.9-10 on Azure Linux 3.0
- azl3 python3 3.12.9-11 on Azure Linux 3.0
- azl3 python3 3.12.9-13 on Azure Linux 3.0
- azl3 python3 3.12.9-14 on Azure Linux 3.0
- azl3 python3 3.12.9-9 on Azure Linux 3.0
- azl4 python-py 1.11.0-22.azl4 on Azure Linux 4.0
- cbl2 python3 3.9.19-19
- cbl2 python3 3.9.19-19 on CBL Mariner 2.0
- cbl2 python3 3.9.19-19 on CBL-Mariner 2.0
✅ Updates Microsoft lists: 2 updates
2 rows: one per KB article or update, update type and fixed build. Their details are on Microsoft's advisory.
| KB article | Update | Fixed build |
|---|---|---|
| — | Security Update | 3.12.9-14 |
| — | Security Update | — |
🧭 EchelonGraph on CVE-2026-3644
- EchelonGraph score
- 7.5 HIGH
- 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
The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output().
Published by Python Software Foundation, the CVE Numbering Authority that assigned CVE-2026-3644, 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).