{"affected":[{"defaultStatus":"unaffected","ecosystem":"composer","packageName":"zbateson/mail-mime-parser","product":"mail-mime-parser","source":"CNA: VulnCheck","vendor":"zbateson","versions":[{"lessThan":"3.0.9","status":"affected","version":"0.3.0","versionType":"semver"},{"lessThan":"4.0.6","status":"affected","version":"4.0.0","versionType":"semver"}]}],"cveId":"CVE-2026-121946","cwes":["CWE-93"],"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.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":6.9,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0"},{"score":7.2,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","version":"3.1"}],"modifiedAt":1793795483166,"publishedAt":1793795483166,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/zbateson/mail-mime-parser/security/advisories/GHSA-gmgm-r6fh-fq6g"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/zbateson/mail-mime-parser/commit/f385b2923023a9a7b69003468e363a4661f1c85a"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/zbateson/mail-mime-parser/commit/1fa840ef367958e991e6840b4e3ffd41aca9d147"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/zbateson/mail-mime-parser/commit/c31c62ccc3e66a7a7da0d79954ef83807f9daa20"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/zbateson/mail-mime-parser/commit/b032920875c6cb35bb2ddd7abfd7e98608d75bc0"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/zbateson/mail-mime-parser/blob/4.0.5/src/Message/Helper/MultipartHelper.php#L270-L273"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/zbateson-mail-mime-parser-before-3.0.9-and-4-x-before-4.0.6-crlf-header-injection-via-message-builders"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/zbateson/mail-mime-parser/commit/f385b2923023a9a7b69003468e363a4661f1c85a"},{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/zbateson/mail-mime-parser/commit/1fa840ef367958e991e6840b4e3ffd41aca9d147"},{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/zbateson/mail-mime-parser/commit/c31c62ccc3e66a7a7da0d79954ef83807f9daa20"},{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/zbateson/mail-mime-parser/commit/b032920875c6cb35bb2ddd7abfd7e98608d75bc0"}],"revision":"3c9c0a95f0840d46bd424151c9279d4b91a88eeb494faa1c8c1b9050d7dfd90a","sources":[{"modifiedAt":1793795483166,"name":"CNA: VulnCheck","retrievedAt":1793797824851,"url":"https://www.cve.org/CVERecord?id=CVE-2026-121946"}],"ssvc":null,"status":"published","title":"zbateson mail-mime-parser before 3.0.9 and 4.x before 4.0.6 CRLF Header Injection via Message Builders","updatedAt":1793797824851}