CVE-2026-110636

CRITICAL 9.8

pypdftk through 0.5 OS Command Injection via PDF and Output Paths

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-78
Vendor	revolunet
Product	pypdftk
Published	Oct 14, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

revolunet / pypdftk

0 ≤ 0.5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/revolunet/pypdftk/issues/56 github.com: https://github.com/revolunet/pypdftk/pull/57 github.com: https://github.com/revolunet/pypdftk/blob/1d3b40c3b42fb3cc6b0192d34aba2c21a1efd369/pypdftk.py#L87-L123 github.com: https://github.com/revolunet/pypdftk vulncheck.com: https://www.vulncheck.com/advisories/pypdftk-through-0.5-os-command-injection-via-pdf-and-output-paths

Credits

gnsehfvlr Zachariah Mithani