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一、 漏洞 CVE-2026-23829 基础信息
漏洞信息
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Vulnerability Title
Mailpit has SMTP Header Injection via Regex Bypass
来源: 美国国家漏洞数据库 NVD
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.
来源: 美国国家漏洞数据库 NVD
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
来源: 美国国家漏洞数据库 NVD
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
来源: 美国国家漏洞数据库 NVD
Vulnerability Title
Mailpit 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
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。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
厂商产品影响版本CPE订阅
axllentmailpit < 1.28.3 -
二、漏洞 CVE-2026-23829 的公开POC
#POC 描述源链接神龙链接
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详情
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详情
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详情
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详情
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三、漏洞 CVE-2026-23829 的情报信息
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IV. Related Vulnerabilities
Same product: mailpit
Same vendor: axllent
Same weakness: CWE-93
V. Comments for CVE-2026-23829

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