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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-46644)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-46644)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
442445	SCA: security update for symfony/polyfill, symfony/polyfill-intl-idn (GHSA-2xf4-cg6j-vhgq)	Tenable Cloud Security	SCA Checks	medium
442445	SCA: security update for symfony/polyfill, symfony/polyfill-intl-idn (GHSA-2xf4-cg6j-vhgq)	Tenable Self-Hosted Container Security	SCA Checks	medium
317085	Linux Distros Unpatched Vulnerability : CVE-2026-46644	Nessus	Misc.	medium

Detections

Analytics

CVE-2026-46644

medium

Tenable Plugins

medium

medium

medium