TI-2026-61498 Aliases CVE-2026-90467 GHSA-qh75-x5jv-g7wg

aiosmtplib before 5.1.3 ESMTP Parameter Injection via unvalidated addresses

LOW 28CWE-88Published 2026-09-12 · Updated 2026-09-14

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: Code execution
Confidentiality · integrity · availability: None · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-88.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00393 33rd percentileScored 2026-11-07

Fix Fixed aiosmtplib (cole): 5.1.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
cole	aiosmtplib	before 5.1.3	5.1.3	Patch available	CNA

aiosmtplib Vendorcole Affected before 5.1.3 Fixed in 5.1.3 Patch available CNA

Remediation

Fix · CNA aiosmtplib (cole) Fixed in 5.1.3

Timeline

2026-10-02 Threatist record created from CVE-2026-90467
2026-10-03 Alias added: GHSA-qh75-x5jv-g7wg

References

Patch 1

Patch Commit

Other 3

TI-2026-38606 aiosmtplib: SMTP command injection via CR/LF in sender/recipient address CVSS 4.0MEDIUM 6.9
TI-2026-40102 aiosmtplib: STARTTLS response injection CVSS 3.1MEDIUM 5.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences