UBUNTU-CVE-2026-53533

See a problem?
Please try reporting it to the source first.

Source

https://ubuntu.com/security/CVE-2026-53533

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53533.json

JSON Data

https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-53533

Upstream

CVE-2026-53533

Published

2026-08-18T18:18:00Z

Modified

2026-09-02T19:41:04Z

Severity

6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:H/SA:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.1, SMTP.mail(), SMTP.rcpt(), SMTP.vrfy(), and SMTP.expn() send caller-supplied addresses without rejecting embedded CR or LF bytes. Data after the line break is framed as additional standalone SMTP command lines, allowing an attacker who influences an envelope sender or recipient to inject commands such as MAIL FROM, RCPT TO, RSET, DATA, or AUTH. SMTP.sendmail() and SMTP.send() without a Message object pass addresses through the affected methods, while SMTP.send_message() is not affected. Successful injection can desynchronize the command-response pipeline, hang the SMTP instance, or send an arbitrary message without requiring attacker control of the SMTP server. This issue is fixed in version 5.1.1.

References

Affected packages

Ubuntu:22.04:LTS / aiosmtplib

Package

Name: aiosmtplib
Purl: pkg:deb/ubuntu/aiosmtplib?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.1.4-1

1.1.4-2

1.1.6-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python3-aiosmtplib",
            "binary_version": "1.1.6-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53533.json"

Ubuntu:26.04:LTS / aiosmtplib

Package

Name: aiosmtplib
Purl: pkg:deb/ubuntu/aiosmtplib?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.0.0-1

4.0.2-1

5.*

5.0.0-1

5.1.0-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "python3-aiosmtplib",
            "binary_version": "5.1.0-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53533.json"