SEPTEMBER 13, 2026
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Case File

CVE-2026-90467

MEDIUM · CVSS 4 EPSS 0.23% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-12 · Last synced 2026-09-13

CyberRota Analysis

AI-Generated

The aiosmtplib library prior to version 5.1.3 is vulnerable due to inadequate validation of email addresses, enabling attackers to inject ESMTP parameters into the MAIL FROM and RCPT TO commands. This flaw can be exploited to forge authenticated identities or manipulate delivery notifications, potentially impacting email integrity and confidentiality. Organizations using aiosmtplib should prioritize upgrading to the latest version to mitigate these risks.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-90467
Severity
MEDIUM
CVSS
4
EPSS
0.23%

Original NVD Description

aiosmtplib before 5.1.3 fails to properly validate email addresses supplied by callers, allowing attackers to inject ESMTP parameters into MAIL FROM and RCPT TO command lines. Attackers can craft malicious addresses containing spaces and angle brackets to append parameters like AUTH, NOTIFY, or ORCPT to envelope commands, forging authenticated identities or forcing delivery notifications to third parties.