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CVE-2026-67445— Mailpit: SMTP command parser buffers unbounded command lines before syntax rejection

Quick assessment

Affected
axllent mailpit
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

axllent mailpit是axllent个人开发者开源的一款邮件测试与调试工具。 axllent mailpit 1.30.4之前版本存在资源管理错误漏洞，该漏洞源于Mailpit在解析SMTP命令前未强制执行命令行大小限制，未经身份验证的远程SMTP客户端可发送超大的单行命令，造成内存压力，可能导致拒绝服务。

CVSS 5.3 · Medium EPSS 0.51% · P41

Affected Version Matrix 1

VendorProduct Version RangeStatus
axllent mailpit < 1.30.4 affected
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I. Basic Information for CVE-2026-67445

Vulnerability Information
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Vulnerability Title
Mailpit: SMTP command parser buffers unbounded command lines before syntax rejection
Source: CVE Program / CVE List V5
Vulnerability Description
Mailpit is an email testing tool and API for developers. Prior to 1.30.4, Mailpit reads SMTP commands through internal/smtpd/smtpd.go session.readLine() using bufio.Reader.ReadString before session.parseLine() parses the verb or the RFC 5321 512-octet command-line limit is enforced. An unauthenticated remote SMTP client can send an oversized single command line that is fully allocated before syntax rejection or timeout, and the normal MaxMessageSize and DATA limits do not apply to this pre-DATA path. The same command reader is used by handleAuthLogin(), handleAuthPlain(), and handleAuthCramMD5() continuation lines, so concurrent oversized inputs can create memory pressure and reduce service availability. This issue is fixed in version 1.30.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
axllent mailpit 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
axllent mailpit是axllent个人开发者开源的一款邮件测试与调试工具。 axllent mailpit 1.30.4之前版本存在资源管理错误漏洞，该漏洞源于Mailpit在解析SMTP命令前未强制执行命令行大小限制，未经身份验证的远程SMTP客户端可发送超大的单行命令，造成内存压力，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
axllent mailpit < 1.30.4 -

II. Public POCs for CVE-2026-67445

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III. Intelligence Information for CVE-2026-67445

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Patches & Fixes for CVE-2026-67445 (1)

Vendor Advisories for CVE-2026-67445 (1)

Vendor Pages for CVE-2026-67445 (1)

Same Patch Batch · axllent · 2026-08-20 · 4 CVEs total

CVE-2026-67448 6.5 MEDIUM Mailpit: WebSocket origin check bypass via percent-encoded path (regression of CVE-2026-22
CVE-2026-67446 5.3 MEDIUM Mailpit: Thumbnail generation decodes unbounded image dimensions before scaling
CVE-2026-67447 5.3 MEDIUM Mailpit: SMTP DATA line reader buffers over-limit input before size enforcement

IV. Related Vulnerabilities

Same product: mailpit
Same vendor: axllent
Same weakness: CWE-400

V. Comments for CVE-2026-67445

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