Symfony Polyfill vulnerabilities

1 vulnerability

Known vulnerabilities in Symfony Polyfill, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.

6.9CVE-2026-46644chainguardnextcloud-server-31+8
EPSS score
0.54%
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.