{"id":"DEBIAN-CVE-2026-46644","details":"Symfony Polyfill backports PHP features and provides compatibility layers for extensions and functions. From 1.17.1 until 1.38.1, symfony/polyfill-intl-idn accepts xn-- labels whose Punycode payload is empty or decodes to ASCII-only code points because Idn::process() does not enforce the UTS #46 revision 33 requirement that decoded ACE labels contain at least one non-ASCII code point. Originally unequal domain names can be regarded as equal, which can lead to blacklist bypassing, inconsistent URL parsing, and server-side request forgery in applications using the polyfill to canonicalise or compare hostnames. This issue is fixed in version 1.38.1.","modified":"2026-09-14T17:03:15.765027426Z","published":"2026-07-14T21:16:55.850Z","upstream":["CVE-2026-46644"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-46644"}],"affected":[{"package":{"name":"php-symfony-polyfill","ecosystem":"Debian:12","purl":"pkg:deb/debian/php-symfony-polyfill?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.27.0-2","1.28.0-1","1.29.0-1","1.29.0-2","1.29.0-3","1.30.0-1","1.31.0-1","1.31.0-2","1.31.0-3","1.31.0-4","1.31.0-5","1.32.0-1","1.33.0-1","1.33.0-2","1.33.0-3","1.33.0-4","1.33.0-5","1.33.0-6","1.36.0-1","1.37.0-1","1.38.1-1","1.40.0-1","1.40.0-2","1.41.0-1","1.41.0-2","1.42.0-1","1.42.0-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-46644.json"}},{"package":{"name":"php-symfony-polyfill","ecosystem":"Debian:14","purl":"pkg:deb/debian/php-symfony-polyfill?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.38.1-1"}]}],"versions":["1.1.0-1","1.1.1-1","1.17.0-1","1.17.0-2","1.17.1-1","1.18.0-1","1.18.1-1","1.2.0-1","1.21.0-1","1.21.0-2","1.22.0-1","1.22.0-1~exp1","1.22.0-2","1.22.0-3","1.22.1-1","1.23.0-1","1.23.1-1","1.23.1-2","1.24.0-1","1.25.0-1","1.25.0-2","1.25.0-3","1.25.0-4","1.26.0-1","1.26.0-2","1.26.0-3","1.27.0-1","1.27.0-1~new","1.27.0-2","1.28.0-1","1.29.0-1","1.29.0-2","1.29.0-3","1.30.0-1","1.31.0-1","1.31.0-2","1.31.0-3","1.31.0-4","1.31.0-5","1.32.0-1","1.33.0-1","1.33.0-2","1.33.0-3","1.33.0-4","1.33.0-5","1.33.0-6","1.36.0-1","1.37.0-1","1.5.0-1","1.6.0-1","1.6.0-2","1.7.0-1","1.8.0-1","1.9.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-46644.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}