pontedilana php-weasyprint up to 2.5.0 Setting escapeshellarg binary os command injection

Summaryinfo

A vulnerability labeled as critical has been found in pontedilana php-weasyprint up to 2.5.0. Affected by this vulnerability is the function escapeshellarg of the file /usr/local/bin/weasyprint of the component Setting Handler. The manipulation of the argument binary results in os command injection. This vulnerability was named CVE-2026-49260. The attack needs to be approached locally. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in pontedilana php-weasyprint up to 2.5.0. Affected is the function escapeshellarg of the file /usr/local/bin/weasyprint of the component Setting Handler. The manipulation of the argument binary with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

PhpWeasyPrint is a PHP library allowing PDF generation from a URL or an HTML page. Prior to version 2.5.1, `pontedilana/php-weasyprint` builds the shell command for WeasyPrint by passing the binary path through `escapeshellarg()` first and then checking the *quoted* result with `is_executable()`. On POSIX `escapeshellarg('/usr/local/bin/weasyprint')` returns `'/usr/local/bin/weasyprint'` with the single-quote characters as part of the string, so `is_executable()` looks for a file whose actual name includes those quotes. That file never exists, the "safe" branch is dead code, and the raw `$binary` string (set via the constructor or `setBinary()`) flows directly into `Symfony\Component\Process\Process::fromShellCommandline()`. Any deployment whose binary path is sourced from configuration, an environment variable, or a per-tenant setting reaches a shell-command-injection sink. The library is documented as a one-to-one substitute for KnpLabs/snappy and inherited the exact pre-fix codepath KnpLabs patched in GHSA-vpr4-p6fq-85jc. PhpWeasyPrint version 2.5.1 contains a patch for the issue.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-49260 since 05/28/2026. The exploitability is told to be easy. Local access is required to approach this attack. Additional levels of successful authentication are necessary for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

Upgrading to version 2.5.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 9e86a2b317237fc5728f712f5037164530117f7e is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Programming Language Software

Vendor

• pontedilana

Name

• php-weasyprint

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5.0

License

• open-source

Website

• Product: https://github.com/pontedilana/php-weasyprint/

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