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0 Symfony Polyfill's symfony/polyfill-intl-idn component versions from 1.17.1 up to but not including 1.38.1 improperly validate certain domain name labels. Specifically, it accepts xn-- labels with empty or ASCII-only Punycode payloads, violating the UTS #46 standard that requires at least one non-ASCII code point. This flaw can cause originally distinct domain names to be treated as equivalent, potentially enabling blacklist bypass, inconsistent URL parsing, and server-side request forgery in applications relying on this polyfill for hostname canonicalization or comparison. The issue is resolved starting with version 1.38.1. Join the discussion | CVE Database V5 | 07/14/2026, 20:48:31 UTC Added: 07/14/2026, 21:18:07 UTC |
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