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CVE-2026-121946— zbateson mail-mime-parser before 3.0.9 and 4.x before 4.0.6 CRLF Header Injection via Message Builders

Quick assessment

Affected
zbateson mail-mime-parser
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.

在版本 3.0.9 之前以及 4.x 系列中 4.0.6 之前的 zbateson mail-mime-parser 存在一个 CRLF 头部注入漏洞。该漏洞源于构建消息的辅助函数未能正确剥离回车（CR）和换行（LF）字符。攻击者通过提供精心构造的 MIME 类型、字符集、编码、micalg 或协议值，可在发出的邮件中注入额外的头部行，例如伪造的 Bcc 字段。

CVSS 7.2 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-121946

Vulnerability Information
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Vulnerability Title
zbateson mail-mime-parser before 3.0.9 and 4.x before 4.0.6 CRLF Header Injection via Message Builders
Source: CVE Program / CVE List V5
Vulnerability Description
zbateson mail-mime-parser before 3.0.9 and 4.x before 4.0.6 contains a CRLF header injection vulnerability in message-building helpers that fail to strip CR and LF characters. Attackers supplying crafted MIME type, charset, encoding, micalg, or protocol values can inject extra header lines such as a forged Bcc into outgoing messages.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
zbateson mail-mime-parser 0.3.0 ~ 3.0.9 -

II. Public POCs for CVE-2026-121946

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III. Intelligence Information for CVE-2026-121946

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Other References for CVE-2026-121946 (7)

IV. Related Vulnerabilities

Same product: mail-mime-parser
Same vendor: zbateson
Same weakness: CWE-93