{"id":"CVE-2026-125756","summary":"postal-mime before 4.2.1 Sender Spoofing via Address Parser Domain Truncation","details":"postal-mime before 4.2.1 contains a parser differential vulnerability in its address parser that truncates the domain at folding whitespace or comments preceding a dot. Remote attackers can craft From headers that pass SPF/DKIM/DMARC alignment for their own subdomain while PostalMime.parse() reports a spoofed victim sender address.","aliases":["GHSA-jh3p-792r-98gm"],"modified":"2026-11-11T02:48:49.977716523Z","published":"2026-11-10T15:22:50.822Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/125xxx/CVE-2026-125756.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-436"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/125xxx/CVE-2026-125756.json"},{"type":"ARTICLE","url":"https://github.com/postalsys/postal-mime/blob/939a220bd518f54d98a088c315d7227e6215cae3/src/address-parser.ts#L265"},{"type":"FIX","url":"https://github.com/postalsys/postal-mime/commit/646725704463839f233472453b7c8306bd1dde21"},{"type":"ADVISORY","url":"https://github.com/postalsys/postal-mime/releases/tag/v4.2.1"},{"type":"ADVISORY","url":"https://github.com/postalsys/postal-mime/security/advisories/GHSA-jh3p-792r-98gm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-125756"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/postal-mime-before-4.2.1-sender-spoofing-via-address-parser-domain-truncation"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/postalsys/postal-mime","events":[{"introduced":"0"},{"fixed":"5828feb9a79e48f8d64bfd0b9ef71c7f607bfb5d"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0"},{"fixed":"4.2.1"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"}]}}],"versions":["v4.2.0","v4.1.4","v4.1.3","v4.1.2","v4.1.1","v4.1.0","v4.0.11","v4.0.10","v4.0.9","v4.0.8","v4.0.7","v4.0.6","v4.0.5","v4.0.4","v4.0.3","v4.0.2","v4.0.1","v4.0.0","v3.0.1","v3.0.0","v2.7.6","v2.7.5","v2.7.4","v2.7.3","v2.7.2","v2.7.1","v2.7.0","v2.6.1","v2.6.0","v2.5.0","v2.4.6","v2.4.2","v2.4.1","v2.4.0","v2.3.2","v2.2.7","v2.2.2","v2.2.1","v2.1.2","v2.1.1","v2.1.0","v2.0.2","v2.0.0","v1.1.0","v1.0.16","v1.0.15","v1.0.14","v1.0.13","v1.0.12","v1.0.11","v1.0.10","v1.0.9","v1.0.8","v1.0.7","v1.0.6","v1.0.5","v1.0.4","v1.0.3","v1.0.2","v1.0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-125756.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"}]}