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Servers and applications

CVE-2026-115559

imaplib STARTTLS serves plaintext bytes buffered before the handshake as if they came over TLS

Severity
Medium 6.3
Published
10 Nov 2026
Last changed
10 Nov 2026
Added to UpHeron
10 Nov 2026
Fixed in
3.16.0
Sources
CVE Program

Affected software

SoftwareAffected versions
PythonServers and applications · cna:python software foundation|cpython
  • Every version before 3.16.0

References

  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-115559