CVE-2026-67447

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Source
https://cve.org/CVERecord?id=CVE-2026-67447
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67447.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-67447
Aliases
Downstream
Related
Published
2026-08-20T21:15:06Z
Modified
2026-09-09T18:26:44Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
Mailpit: SMTP DATA line reader buffers over-limit input before size enforcement
Details

Mailpit is an email testing tool and API for developers. From 1.30.0 until 1.30.5, Mailpit's internal/smtpd/smtpd.go readData() function calls bufio.Reader.ReadBytes before applying the len(data)+len(line) size check to the completed SMTP DATA line against Server.MaxSize. An unauthenticated SMTP client can send a single line larger than the configured MaxMessageSize, causing the full line to be allocated before Mailpit returns the 552 5.3.4 rejection. This post-fix gap remains after normal multi-line DATA accumulation was bounded, and concurrent oversized lines can create substantial memory pressure beyond the configured message-size cap. This issue is fixed in version 1.30.5.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67447.json"
}
References

Affected packages

Git / github.com/axllent/mailpit

Affected ranges

Type
GIT
Repo
https://github.com/axllent/mailpit
Events
Introduced
af8756a32cf7ecf06bef109c1348b783f1a239ee
Fixed
8720c6bd8281fc00d458081908f1dbef8e59a98c
Fixed
e219c7379345a0e826f6f216cccc51e1328008d7
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "1.30.0"
        },
        {
            "fixed": "1.30.5"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v1.*
v1.30.0
v1.30.1
v1.30.2
v1.30.3
v1.30.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67447.json"