CVE-2026-49260 php-weasyprint: shell command injection via configurable WeasyPrint binary path due to inverted is_executable() guard (mirror of KnpLabs/snappy GHSA-vpr4-p6fq-85jc)
Attackers can execute arbitrary shell commands if the WeasyPrint binary path is configurable, due to a flawed executable check.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-49260?
CVE-2026-49260 is a high-severity command injection vulnerability in pontedilana php-weasyprint, published on 19 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-78
Which versions are affected by CVE-2026-49260?
2 open source packages ship an affected version, including pontedilana/php-weasyprint.
| Package | Affected | Fixed in |
|---|---|---|
pontedilana/php-weasyprint Packagist | All versions | 2.5.1 |
pontedilana/php-weasyprint Packagist | All versions | 2.5.1 |
How do I fix CVE-2026-49260?
Upgrade pontedilana/php-weasyprint to 2.5.1 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-49260 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49260 exists.
Sources
Also known as GHSA-f5gc-qxf8-mh9g.