Vulnerability · Published Oct 14, 2026 · Assigned by VulnCheck
CVE-2026-110636pypdftk through 0.5 OS Command Injection via PDF and Output Paths
Critical 9.8
In plain English
A critical-severity OS command injection in pypdftk from revolunet. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 2.7% (higher than 86% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)2.7%top 14.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/revolunet/pypdftk/issues/56 issue-tracking
- https://github.com/revolunet/pypdftk/pull/57 issue-tracking, patch
- https://github.com/revolunet/pypdftk/blob/1d3b40c3b42fb3cc6b0192d34aba2c21a1efd369/pypdftk.py#L87-L123 technical-description
- https://github.com/revolunet/pypdftk product
- VulnCheck Advisory: pypdftk through 0.5 OS Command Injection via PDF and Output Paths third-party-advisory