CVE-2026-49286: CWE-502: Deserialization of Untrusted Data in pontedilana php-weasyprint
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.
AI Analysis
Technical Summary
PhpWeasyPrint is a PHP library for generating PDFs from URLs or HTML pages. Versions before 2.6.0 use a case-sensitive blacklist to block the phar:// stream wrapper in output filenames, but PHP stream wrappers are case-insensitive. This allows attackers to bypass the blacklist using case variations (e.g., PHAR://), triggering file_exists() in prepareOutput() and causing deserialization of malicious PHAR archive metadata on PHP 7.4 and later. This vulnerability is a patch bypass of CVE-2023-28115 and is fixed in version 2.6.0.
Potential Impact
Successful exploitation can lead to remote code execution with high confidentiality, integrity, and availability impact on affected systems running vulnerable versions of php-weasyprint on PHP 7.4 or later. This can allow attackers to execute arbitrary code remotely.
Mitigation Recommendations
Upgrade php-weasyprint to version 2.6.0 or later, which contains the official patch for this vulnerability. No other mitigations are specified. Patch status is not explicitly stated in the vendor advisory, but version 2.6.0 includes the fix.
CVE-2026-49286: CWE-502: Deserialization of Untrusted Data in pontedilana php-weasyprint
Description
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.
CVSS v3.1
Score 8.1high
Affected software
pkg:composer/pontedilana/php-weasyprintRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
PhpWeasyPrint is a PHP library for generating PDFs from URLs or HTML pages. Versions before 2.6.0 use a case-sensitive blacklist to block the phar:// stream wrapper in output filenames, but PHP stream wrappers are case-insensitive. This allows attackers to bypass the blacklist using case variations (e.g., PHAR://), triggering file_exists() in prepareOutput() and causing deserialization of malicious PHAR archive metadata on PHP 7.4 and later. This vulnerability is a patch bypass of CVE-2023-28115 and is fixed in version 2.6.0.
Potential Impact
Successful exploitation can lead to remote code execution with high confidentiality, integrity, and availability impact on affected systems running vulnerable versions of php-weasyprint on PHP 7.4 or later. This can allow attackers to execute arbitrary code remotely.
Mitigation Recommendations
Upgrade php-weasyprint to version 2.6.0 or later, which contains the official patch for this vulnerability. No other mitigations are specified. Patch status is not explicitly stated in the vendor advisory, but version 2.6.0 includes the fix.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-28T20:07:58.862Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a358c5cf198dc38c1f2fbc6
Added to database: 06/19/2026, 18:37:16 UTC
Last enriched: 06/26/2026, 19:22:08 UTC
Last updated: 08/04/2026, 12:46:13 UTC
Views: 67
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