{"schemaVersion":3,"id":"CVE-2026-46644","aliases":["UBUNTU-CVE-2026-46644","DEBIAN-CVE-2026-46644","CGA-3p5c-4m3c-rg2w","CGA-6wx4-m5r7-hpgq","CGA-7hc6-3pj8-7wrq","CGA-cwxh-f8x6-8rch","CGA-g7gw-mfw8-w237","CGA-xqm7-w76q-4548"],"status":"published","duplicateOf":null,"title":null,"description":"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. 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