Detections
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SCA: security update for symfony/polyfill, symfony/polyfill-intl-idn (GHSA-2xf4-cg6j-vhgq)

medium Tenable Self-Hosted Container Security Plugin ID 442445

Description

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)

Solution

Update the symfony/polyfill library and its related packages to version 1.38.1 or later.

See Also

https://github.com/advisories/GHSA-2xf4-cg6j-vhgq

Plugin Details

Severity: Medium

ID: 442445

Version: Revision 1.4

Type: Local

Family: SCA Checks

Published: 5/29/2026

Updated: 7/15/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.93

Vendor

Vendor Severity: Low

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2026-46644

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 2.7

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/28/2026

Vulnerability Publication Date: 5/28/2026

Reference Information

CVE: CVE-2026-46644