Vulnerability · Published Jun 19, 2026 · Assigned by GitHub_M
CVE-2026-49286PhpWeasyPrint vulnerable to PHAR deserialization via output filename (CVE-2023-28115 case-insensitive bypass)
High 8.1
In plain English
A high-severity unsafe deserialization in php-weasyprint from pontedilana. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | pontedilana/php-weasyprint | 2.6.0 | GHSA-2fmj-p74r-3wjm |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| pontedilana | php-weasyprint | < 2.6.0 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/pontedilana/php-weasyprint/security/advisories/GHSA-2fmj-p74r-3wjm x_refsource_CONFIRM
- https://github.com/KnpLabs/snappy/security/advisories/GHSA-92rv-4j2h-8mjj x_refsource_MISC
- https://github.com/pontedilana/php-weasyprint/commit/d1aa487722b5a3cab9b222b85fdb5608a5a550c3 x_refsource_MISC
- https://github.com/pontedilana/php-weasyprint/releases/tag/2.6.0 x_refsource_MISC