Vulnerability · Published Jun 10, 2026 · Assigned by GitHub_M
CVE-2026-46643Snappy: Binary path is never shell-escaped due to an inverted is_executable check
High 7.5
In plain English
A high-severity OS command injection in snappy from KnpLabs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Snappy is a PHP library allowing thumbnail, snapshot or PDF generation from a url or a html page. Prior to version 1.7.1, on POSIX, escapeshellarg(‘/usr/bin/wkhtmltopdf’) returns the literal string ‘/usr/bin/wkhtmltopdf’ with the single-quote characters included. is_executable() then looks for a file whose actual name contains those quote characters, which essentially never exists. The safe branch is dead code and $command always falls through to the raw, unescaped value. The rest of the arguments (options, input, output) are escaped correctly, so injection has to land in the binary string itself. That happens whenever the binary path is sourced from configuration that is user-influenced, derived from environment variables that ultimately come from request data, or concatenated with any user-controlled fragment. This issue has been patched in version 1.7.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | knplabs/knp-snappy | 1.7.1 | GHSA-vpr4-p6fq-85jc |
Affected products (as reported)
Weakness: CWE-78 · Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/KnpLabs/snappy/security/advisories/GHSA-vpr4-p6fq-85jc x_refsource_CONFIRM
- https://github.com/KnpLabs/snappy/releases/tag/v1.7.1 x_refsource_MISC