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Microsoft Security Response CenterCVE-2026-3644

Incomplete control character validation in http.cookies

Mariner

Read the vendor bulletin Get alerts for azl3 python3 3.12.9-9 on Azure Linux
7.5CVSS out of 10Medium severity
Scope

What the vendor says is affected

  • azl3 python3 3.12.9-9 on Azure Linux 3.0
  • cbl2 python3 3.9.19-19 on CBL Mariner 2.0
  • azl3 python3 3.12.9-10 on Azure Linux 3.0
  • cbl2 python3 3.9.19-19
  • azl3 python3 3.12.9-14 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
  • cbl2 python3 3.9.19-19 on CBL-Mariner 2.0

Versions the vendor lists as fixed

  • 3.12.9-14
Next step

What the vendor recommends

CBL-Mariner Releases Release Notes

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-3644View CVSS, KEV, EPSS, and threat context
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