Vulnerability in php-symfony-polyfill (DEBIAN-CVE-2026-46644)
Summary
Vulnerability in php-symfony-polyfill (DEBIAN-CVE-2026-46644). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1.38.1-1 or later.
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A weakness called DEBIAN-CVE-2026-46644 was discovered in php-symfony-polyfill.
Severity is Info. Low severity or not yet rated.
What you should do: update the affected software to the latest version. If unsure, ask your IT team or search the vendor's site for "php-symfony-polyfill DEBIAN-CVE-2026-46644".
DEBIAN-CVE-2026-46644 (php-symfony-polyfill). Severity: Info.
Response plan:
- Check the vendor advisory for affected versions and the patched release.
- If a vulnerable version is running in production, schedule maintenance (urgency from KEV/CVSS).
- If no patch yet, mitigate via WAF rule, disabling the affected feature, etc.
- Monitor logs / SIEM for known IOC and PoC signatures of this CVE.
PoCs and fix commits: see the 'References' section, MITRE, and NVD.
A weakness (DEBIAN-CVE-2026-46644) in php-symfony-polyfill. A serious software flaw has been identified.
Target versions of php-symfony-polyfill (see vendor advisory). If running in production, identify exposure immediately.
Severity: Info. Low severity or not yet rated.
Update to the patched release as listed in the vendor advisory.
If a patch is not yet available, consider disabling the affected feature, applying WAF rules, blocking via network ACLs, or isolating the vulnerable version.
Check version information, scan dependencies via SBOM, and monitor SIEM for IOC and PoC signatures related to this CVE.
Affected packages
References
- advisory security-tracker.debian.org