{"id":"UBUNTU-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":"2026-07-15T19:47:22.978583945Z","published":"2026-07-14T21:16:00Z","upstream":["CVE-2026-46644"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-46644"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-46644"},{"type":"REPORT","url":"https://symfony.com/blog/cve-2026-46644-insecure-equivalence-in-symfony-polyfill-intl-idn-for-ascii-only-xn-labels"},{"type":"REPORT","url":"https://github.com/symfony/polyfill/security/advisories/GHSA-2xf4-cg6j-vhgq"}],"affected":[{"package":{"name":"php-symfony-polyfill","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/php-symfony-polyfill?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.0-1ubuntu1","1.6.0-1","1.6.0-2"],"ecosystem_specific":{"binaries":[{"binary_name":"php-symfony-polyfill","binary_version":"1.6.0-2"},{"binary_version":"1.6.0-2","binary_name":"php-symfony-polyfill-apcu"},{"binary_name":"php-symfony-polyfill-iconv","binary_version":"1.6.0-2"},{"binary_version":"1.6.0-2","binary_name":"php-symfony-polyfill-intl-grapheme"},{"binary_name":"php-symfony-polyfill-intl-icu","binary_version":"1.6.0-2"},{"binary_name":"php-symfony-polyfill-intl-normalizer","binary_version":"1.6.0-2"},{"binary_name":"php-symfony-polyfill-mbstring","binary_version":"1.6.0-2"},{"binary_version":"1.6.0-2","binary_name":"php-symfony-polyfill-php54"},{"binary_name":"php-symfony-polyfill-php55","binary_version":"1.6.0-2"},{"binary_name":"php-symfony-polyfill-php56","binary_version":"1.6.0-2"},{"binary_name":"php-symfony-polyfill-php70","binary_version":"1.6.0-2"},{"binary_name":"php-symfony-polyfill-php71","binary_version":"1.6.0-2"},{"binary_name":"php-symfony-polyfill-php72","binary_version":"1.6.0-2"},{"binary_name":"php-symfony-polyfill-util","binary_version":"1.6.0-2"},{"binary_version":"1.6.0-2","binary_name":"php-symfony-polyfill-xml"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-46644.json"}},{"package":{"name":"php-symfony-polyfill","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/php-symfony-polyfill?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.22.1-1","1.23.1-1","1.24.0-1ubuntu1","1.24.0-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.24.0-1ubuntu2","binary_name":"php-symfony-polyfill"},{"binary_version":"1.24.0-1ubuntu2","binary_name":"php-symfony-polyfill-apcu"},{"binary_version":"1.24.0-1ubuntu2","binary_name":"php-symfony-polyfill-ctype"},{"binary_name":"php-symfony-polyfill-iconv","binary_version":"1.24.0-1ubuntu2"},{"binary_name":"php-symfony-polyfill-intl-grapheme","binary_version":"1.24.0-1ubuntu2"},{"binary_name":"php-symfony-polyfill-intl-icu","binary_version":"1.24.0-1ubuntu2"},{"binary_name":"php-symfony-polyfill-intl-idn","binary_version":"1.24.0-1ubuntu2"},{"binary_name":"php-symfony-polyfill-intl-messageformatter","binary_version":"1.24.0-1ubuntu2"},{"binary_name":"php-symfony-polyfill-intl-normalizer","binary_version":"1.24.0-1ubuntu2"},{"binary_name":"php-symfony-polyfill-mbstring","binary_version":"1.24.0-1ubuntu2"},{"binary_version":"1.24.0-1ubuntu2","binary_name":"php-symfony-polyfill-php72"},{"binary_name":"php-symfony-polyfill-php73","binary_version":"1.24.0-1ubuntu2"},{"binary_name":"php-symfony-polyfill-php74","binary_version":"1.24.0-1ubuntu2"},{"binary_name":"php-symfony-polyfill-php80","binary_version":"1.24.0-1ubuntu2"},{"binary_name":"php-symfony-polyfill-php81","binary_version":"1.24.0-1ubuntu2"},{"binary_name":"php-symfony-polyfill-util","binary_version":"1.24.0-1ubuntu2"},{"binary_name":"php-symfony-polyfill-uuid","binary_version":"1.24.0-1ubuntu2"},{"binary_version":"1.24.0-1ubuntu2","binary_name":"php-symfony-polyfill-xml"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-46644.json"}},{"package":{"name":"php-symfony-polyfill","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/php-symfony-polyfill?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.27.0-2","1.28.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"php-symfony-polyfill","binary_version":"1.28.0-1"},{"binary_name":"php-symfony-polyfill-apcu","binary_version":"1.28.0-1"},{"binary_version":"1.28.0-1","binary_name":"php-symfony-polyfill-ctype"},{"binary_name":"php-symfony-polyfill-iconv","binary_version":"1.28.0-1"},{"binary_name":"php-symfony-polyfill-intl-grapheme","binary_version":"1.28.0-1"},{"binary_name":"php-symfony-polyfill-intl-icu","binary_version":"1.28.0-1"},{"binary_name":"php-symfony-polyfill-intl-idn","binary_version":"1.28.0-1"},{"binary_name":"php-symfony-polyfill-intl-messageformatter","binary_version":"1.28.0-1"},{"binary_name":"php-symfony-polyfill-intl-normalizer","binary_version":"1.28.0-1"},{"binary_name":"php-symfony-polyfill-mbstring","binary_ver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