{"id":"OESA-2026-4104","summary":"rubygem-mail security update","details":"A really Ruby Mail handler.\r\n\r\nSecurity Fix(es):\n\nAffected versions of this package are vulnerable to Improper Validation of Syntactic Correctness of Input through `q_value_decode` and `b_value_decode` in `lib/mail/utilities.rb`. An attacker can make a display name or local part decode to a different address than intended by supplying a malformed RFC 2047 encoded-word, including one that embeds extra encoded-word markers or additional text. The decoders only matched the first encoded-word and used a greedy charset capture, so a crafted header could cause the parsed `From`, `To`, or `Reply-To` value to omit or reshuffle literal text. Applications that display, compare, or authorize based on the decoded address can then present or act on a spoofed sender or recipient address.(CVE-2026-63435)","modified":"2026-09-25T01:45:13.763754073Z","published":"2026-09-25T01:28:27Z","upstream":["CVE-2026-63435"],"database_specific":{"severity":"Medium"},"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4104"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63435"}],"affected":[{"package":{"name":"rubygem-mail","ecosystem":"openEuler:24.03-LTS-SP1","purl":"pkg:rpm/openEuler/rubygem-mail&distro=openEuler-24.03-LTS-SP1"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.8.1-2.oe2403sp1"}]}],"ecosystem_specific":{"noarch":["rubygem-mail-2.8.1-2.oe2403sp1.noarch.rpm","rubygem-mail-doc-2.8.1-2.oe2403sp1.noarch.rpm"],"src":["rubygem-mail-2.8.1-2.oe2403sp1.src.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2026-4104.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}