CVE-2026-49286

HIGH 8.1

PhpWeasyPrint vulnerable to PHAR deserialization via output filename (CVE-2023-28115 case-insensitive bypass)

CVSS Score

8.1

EPSS Score

0.0%

EPSS Percentile

0th

PhpWeasyPrint is a PHP library allowing PDF generation from a URL or an HTML page. Prior to version 2.6.0, `pontedilana/php-weasyprint` guarded the output filename against the `phar://` stream wrapper with a case-sensitive blacklist. PHP stream wrappers are case-insensitive, so `PHAR://`, `Phar://`, etc. bypass the check and reach `fileExists()` (`file_exists()`) in `prepareOutput()`. On PHP 7 (which the library still supports — PHP 7.4+), this triggers deserialization of a crafted PHAR archive's metadata, leading to remote code execution. This is the patch-bypass of CVE-2023-28115. The same issue and fix were handled upstream in KnpLabs/snappy (GHSA-92rv-4j2h-8mjj). PhpWeasyPrint version 2.6.0 contains a patch for the issue.

CWE	CWE-502
Vendor	pontedilana
Product	php-weasyprint
Published	Jun 19, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

pontedilana / php-weasyprint

< 2.6.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/pontedilana/php-weasyprint/security/advisories/GHSA-2fmj-p74r-3wjm github.com: https://github.com/KnpLabs/snappy/security/advisories/GHSA-92rv-4j2h-8mjj github.com: https://github.com/pontedilana/php-weasyprint/commit/d1aa487722b5a3cab9b222b85fdb5608a5a550c3 github.com: https://github.com/pontedilana/php-weasyprint/releases/tag/2.6.0