revolunet pypdftk up to 0.5 fill_form/dump_data_fields/pdftk_cmd_util pdf_path/out_file os command injection

Summaryinfo

A vulnerability identified as critical has been detected in revolunet pypdftk up to 0.5. This issue affects the function fill_form/dump_data_fields/pdftk_cmd_util. This manipulation of the argument pdf_path/out_file causes os command injection. This vulnerability is registered as CVE-2026-110636. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as critical was found in revolunet pypdftk up to 0.5. Affected by this vulnerability is the function fill_form/dump_data_fields/pdftk_cmd_util. The manipulation of the argument pdf_path/out_file with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-110636 since 10/14/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/14/2026). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• revolunet

Name

• pypdftk

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5

Website

• Product: https://github.com/revolunet/pypdftk/

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