CVE-2026-110636 pypdftk through 0.5 OS Command Injection via PDF and Output Paths
Attackers can execute arbitrary OS commands by injecting shell metacharacters into PDF or output paths in pypdftk.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-110636?
CVE-2026-110636 is a critical command injection vulnerability in revolunet pypdftk, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
pypdftk through 0.5 contains an OS command injection vulnerability in fill_form(), dump_data_fields(), and pdftk_cmd_util() that builds shell commands from caller-supplied paths. Attackers controlling pdf_path or out_file can inject shell metacharacters interpreted by subprocess.Popen with shell=True to execute OS commands as the Python process.
Weakness: CWE-78
Which versions are affected by CVE-2026-110636?
How do I fix CVE-2026-110636?
No fix has been published for CVE-2026-110636 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-110636 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110636 exists.
Sources
Also known as GHSA-hx4x-jq2f-pwr6.