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I. Basic Information for CVE-2026-23829
Vulnerability Information

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Vulnerability Title
Mailpit has SMTP Header Injection via Regex Bypass
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mailpit is an email testing tool and API for developers. Prior to version 1.28.3, Mailpit's SMTP server is vulnerable to Header Injection due to an insufficient Regular Expression used to validate `RCPT TO` and `MAIL FROM` addresses. An attacker can inject arbitrary SMTP headers (or corrupt existing ones) by including carriage return characters (`\r`) in the email address. This header injection occurs because the regex intended to filter control characters fails to exclude `\r` and `\n` when used inside a character class. Version 1.28.3 fixes this issue.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Mailpit 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mailpit是Ralph Slooten个人开发者的一个电子邮件测试工具。 Mailpit 1.28.3之前版本存在安全漏洞,该漏洞源于验证RCPT TO和MAIL FROM地址的正则表达式不足,可能导致标头注入。
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
VendorProductAffected VersionsCPESubscribe
axllentmailpit < 1.28.3 -
II. Public POCs for CVE-2026-23829
#POC DescriptionSource LinkShenlong Link
1FROM HEADER INJECTION TO FULL RCE DOMINANCE The Original Flaw (CVE-2026-23829) · CVSS: 6.1/10 (Medium) - Header injection via regex bypass · Impact: Email spoofing, limited header manipulation · Reality: Boring, basic, barely worth weaponizing CTT Enhancement Revelationhttps://github.com/SimoesCTT/CTT-Mailpit-RCE-v1.0---Temporal-Resonance-Mail-Server-TakeoverPOC Details
2It's a CRLF injection in Mailpit's SMTP server — a classic data corruption vulnerability. But under CTT, it's not just a bug. It's a phase reconstruction opportunity.https://github.com/SimoesCTT/-CVE-2026-23829-CTT-Mailpit-phase-reconstruction-POC Details
3Mailpit < 1.28 contains a header injection caused by insufficient regex validation of `RCPT TO` and `MAIL FROM` addresses in the SMTP server, letting attackers inject arbitrary SMTP headers, exploit requires crafted email addresses https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-23829.yamlPOC Details
4Mailpit < 1.28 contains a header injection caused by insufficient regex validation of `RCPT TO` and `MAIL FROM` addresses in the SMTP server, letting attackers inject arbitrary SMTP headers, exploit requires crafted email addresses https://github.com/projectdiscovery/nuclei-templates/blob/main/network/cves/2026/CVE-2026-23829.yamlPOC Details
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III. Intelligence Information for CVE-2026-23829
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