CVE-2026-90467 (GCVE-0-2026-90467)
Vulnerability from cvelistv5 – Published: 2026-09-12 01:50 – Updated: 2026-09-12 01:50
VLAI
EPSS
VEX
Title
aiosmtplib before 5.1.3 ESMTP Parameter Injection via unvalidated addresses
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.
Severity
CWE
- CWE-88 - Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/cole/aiosmtplib/commit/2e1b210… | patch |
| https://github.com/cole/aiosmtplib/releases/tag/v5.1.3 | release-notes |
| https://github.com/cole/aiosmtplib/blob/v5.1.2/sr… | technical-description |
| https://github.com/cole/aiosmtplib | product |
| https://www.vulncheck.com/advisories/aiosmtplib-b… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| cole | aiosmtplib |
Affected:
0 , < 5.1.3
(semver)
Unaffected: 5.1.3 (semver) |
guessed |
Date Public
2026-09-07 00:00
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}
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},
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"tags": [
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"url": "https://github.com/cole/aiosmtplib"
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"datePublished": "2026-09-12T01:50:34.534Z",
"dateReserved": "2026-09-11T23:36:20.310Z",
"dateUpdated": "2026-09-12T01:50:34.534Z",
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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