VULNRABLE / Vulnerability / CVE-2026-55558

CVE-2026-55558

MEDIUM LOW aiosmtplib GHSA

Exploit verdict: No active-exploit signal

CVSS Score

5.5

Severity

MEDIUM

EPSS

Source

GHSA

Summary

aiosmtplib: STARTTLS response injection

What this means

CVE-2026-55558 is a medium-severity vulnerability affecting aiosmtplib, rated CVSS 5.5. The EPSS model estimates a 0% probability of exploitation in the next 30 days. Published August 28, 2026.

View full advisory at GHSA →