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EUVD-2026-328887

2026-10-14T15:08:06.613609+00:00

EUVD-2026-328887

fkie_cve-2026-49286

2026-10-14T15:08:06.613644+00:00

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.

GHSA-2fmj-p74r-3wjm — PhpWeasyPrint vulnerable to PHAR deserialization via output filename (CVE-2023-28115 case-insensitive bypass)

2026-10-14T15:08:06.613683+00:00

Affected: Packagist: pontedilana/php-weasyprint

### Summary

`pontedilana/php-weasyprint` guarded the output filename against the `phar://` stream wrapper with a case-sensitive blacklist:

```php if (0 === \strpos($filename, 'phar://')) { throw new \InvalidArgumentException('The output file cannot be a phar archive.'); } ```

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](https://github.com/KnpLabs/snappy/security/advisories/GHSA-92rv-4j2h-8mjj)).

### Affected versions

`pontedilana/php-weasyprint` versions `<= 2.5.1` (the case-sensitive guard was introduced in commit `eb8accc`, "Implement countermeasures for CVE-2023-28115").

Patched in: `2.6.0`.

### Privilege required

A caller able to control the output filename passed to `generate()` / `generateFromHtml()`, plus the ability to place a PHAR archive on the filesystem (e.g. via an upload). Exploitation of the deserialization requires the server to run PHP < 8.

### Vulnerable code

`src/AbstractGenerator.php`, `prepareOutput()`:

```php if (0 === \strpos($filename, 'phar://')) { throw new \InvalidArgumentException('The output file cannot be a phar archive.'); } ```

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