RCE in Revolunet Pypdftk
CVE-2026-110636
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.
Vulnerability class: Command Injection (OS Command Injection)
Published .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/revolunet/pypdftk/issues/56 (issue-tracking)
- github.com/revolunet/pypdftk/pull/57 (issue-tracking, patch)
- github.com/revolunet/pypdftk/blob/1d3b40c3b42fb3cc6b0192d34aba2c21a1efd369/pypd… (technical-description)
- github.com/revolunet/pypdftk (product)
- www.vulncheck.com/advisories/pypdftk-through-0.5-os-command-injection-via-pdf-a… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110636?
- CVE-2026-110636 is a critical-severity vulnerability in Revolunet Pypdftk, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-10-14.
- How severe is CVE-2026-110636?
- Critical severity. CVSS v3 base score is 9.8 out of 10.