CVE-2026-90467 Details
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.
A vulnerability in aiosmtplib versions prior to 5.1.3 allows for ESMTP parameter injection through unvalidated email addresses. This issue arises because the library fails to properly validate addresses, enabling attackers to inject parameters into the MAIL FROM and RCPT TO commands. Maliciously crafted addresses can include spaces and angle brackets, which are used to append parameters like AUTH, NOTIFY, or ORCPT, potentially forging authenticated identities or misdirecting delivery notifications.
Users can upgrade to aiosmtplib version 5.1.3 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 12, 2026CISA-ADP
Assessed Sep 14, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-88 | Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| cole aiosmtplib | >= 0, < 5.1.3 |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 14, 2026 | CVE Modified | CISA-ADP |
| Sep 12, 2026 | New CVE Received | [email protected] |