imaplib STARTTLS serves plaintext bytes buffered before the handshake as if they came over TLS
? CVE-2026-115559
What could go wrong?
Microsoft fixed a security weakness. Details are limited to avoid helping attackers.
How urgent is it?
Check Microsoft’s page for details.
Who is affected?
azl3 python-py 1.11.0-1 on Azure Linux 3.0, azl3 python3 3.12.16-1 on Azure Linux 3.0
What should I do?
Install this month’s updates via Windows Update, Intune or your update tool, then restart.
Known problems
Microsoft lists known issues per update: no KB article listed. Official page.