CVE-2026-67445— Mailpit: SMTP command parser buffers unbounded command lines before syntax rejection
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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
Affected Products
II. Public POCs 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)
- 🔗 Release v1.30.4 · axllent/mailpit · GitHubx_refsource_MISC
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
- CVE-2026-67448
Mailpit: WebSocket origin check bypass via percent-encoded p - CVE-2026-67447
Mailpit: SMTP DATA line reader buffers over-limit input befo - CVE-2026-67446
Mailpit: Thumbnail generation decodes unbounded image dimens - CVE-2026-48824
Mailpit: Sibling-endpoint memory-exhaustion DoS via unbounde - CVE-2026-45713
Mailpit: Unauthenticated remote memory-exhaustion DoS via un
Same vendor: axllent
- CVE-2026-67448
Mailpit: WebSocket origin check bypass via percent-encoded p - CVE-2026-67447
Mailpit: SMTP DATA line reader buffers over-limit input befo - CVE-2026-67446
Mailpit: Thumbnail generation decodes unbounded image dimens - CVE-2026-48824
Mailpit: Sibling-endpoint memory-exhaustion DoS via unbounde - CVE-2026-45713
Mailpit: Unauthenticated remote memory-exhaustion DoS via un
Same weakness: CWE-400
- CVE-2026-53531
ratex-parser has unbounded parser recursion that leads to st - CVE-2026-77354
kin-openapi: Uncontrolled resource consumption in openapi3fi - CVE-2026-55241
Checkmate: Pre-auth Denial of Service via File Upload on Reg - CVE-2026-77755
Denial of Service in MISP-STIX Import via Malformed or Overs - CVE-2026-19446
Vulnerabilities in IBM AIX and PowerVM VIOS
V. Comments for CVE-2026-67445
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