High severity7.2NVD Advisory· Published Nov 4, 2026
CVE-2026-121946
CVE-2026-121946
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.
Affected products
1- Range: <3.0.9, <4.0.6
Patches
Vulnerability mechanics
References
7- github.com/zbateson/mail-mime-parser/blob/4.0.5/src/Message/Helper/MultipartHelper.phpnvd
- github.com/zbateson/mail-mime-parser/commit/1fa840ef367958e991e6840b4e3ffd41aca9d147nvd
- github.com/zbateson/mail-mime-parser/commit/b032920875c6cb35bb2ddd7abfd7e98608d75bc0nvd
- github.com/zbateson/mail-mime-parser/commit/c31c62ccc3e66a7a7da0d79954ef83807f9daa20nvd
- github.com/zbateson/mail-mime-parser/commit/f385b2923023a9a7b69003468e363a4661f1c85anvd
- github.com/zbateson/mail-mime-parser/security/advisories/GHSA-gmgm-r6fh-fq6gnvd
- www.vulncheck.com/advisories/zbateson-mail-mime-parser-before-3.0.9-and-4-x-before-4.0.6-crlf-header-injection-via-message-buildersnvd
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