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CVE-2026-45711— Mailpit: Path traversal & arbitrary file write in mailpit dump --http via attacker-controlled message IDs

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。 Ralph Slooten Mailpit 1.30.0之前版本存在安全漏洞，该漏洞源于邮件ID字段被直接拼接到输出路径中，路径连接函数会静默规范化".."段，可能导致恶意HTTP服务器模拟Mailpit实例将受攻击者控制的字节写入预期目录之外的任意路径。

CVSS 5.9 · Medium EPSS 0.39% · P31

Possible ATT&CK Techniques 1 AI

T1041 · Exfiltration Over C2 Channel

Affected Version Matrix 1

VendorProduct Version RangeStatus
axllent mailpit < 1.30.0 affected
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I. Basic Information for CVE-2026-45711

Vulnerability Information
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Vulnerability Title
Mailpit: Path traversal & arbitrary file write in mailpit dump --http via attacker-controlled message IDs
Source: CVE Program / CVE List V5
Vulnerability Description
Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the mailpit dump --http <base-url> <out-dir> sub-command downloads every message from a remote Mailpit instance and writes each one as <id>.eml inside the user-supplied output directory. The message ID field is taken verbatim from the JSON response of the remote server and concatenated into the output path with path.Join, which silently normalizes `..` segments. A malicious HTTP server impersonating Mailpit can therefore make mailpit dump write attacker-controlled bytes to any path the running user can write, fully outside the intended output directory. Version 1.30.0 contains a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Ralph Slooten Mailpit 路径遍历漏洞
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。 Ralph Slooten Mailpit 1.30.0之前版本存在安全漏洞，该漏洞源于邮件ID字段被直接拼接到输出路径中，路径连接函数会静默规范化".."段，可能导致恶意HTTP服务器模拟Mailpit实例将受攻击者控制的字节写入预期目录之外的任意路径。
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 < 1.30.0 -

II. Public POCs for CVE-2026-45711

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III. Intelligence Information for CVE-2026-45711

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Vendor Advisories for CVE-2026-45711 (1)

Vendor Pages for CVE-2026-45711 (1)

Same Patch Batch · axllent · 2026-07-20 · 5 CVEs total

CVE-2026-45713 7.5 HIGH Mailpit: Unauthenticated remote memory-exhaustion DoS via unlimited SMTP DATA and /api/v1/
CVE-2026-45712 5.9 MEDIUM Mailpit: Concurrent map read & write in proxy CSS rewriter - remote unauth crash (fatal er
CVE-2026-45709 5.8 MEDIUM Mailpit has an incomplete fix for GHSA-6jxm: HTML check still permits SSRF to private/loop
CVE-2026-48824 5.3 MEDIUM Mailpit: Sibling-endpoint memory-exhaustion DoS via unbounded JSON body on /api/v1/message

IV. Related Vulnerabilities

Same product: mailpit
Same vendor: axllent
Same weakness: CWE-22

V. Comments for CVE-2026-45711

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