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CVE-2026-110636— pypdftk through 0.5 OS Command Injection via PDF and Output Paths

Quick assessment

Affected
revolunet pypdftk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

pypdftk 0.5 及之前版本中存在操作系统命令注入漏洞，该漏洞出现在 、 和 函数中。这些函数在使用调用方提供的路径构建 shell 命令时存在安全隐患。如果攻击者控制了 或 参数，他们可以注入会被 （以 方式执行）解析的 shell 元字符，从而导致以 Python 进程的身份执行任意操作系统命令。

CVSS 9.8 · Critical EPSS 2.35% · P83

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
revolunet pypdftk ≤ 0.5 affected
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I. Basic Information for CVE-2026-110636

Vulnerability Information
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Vulnerability Title
pypdftk through 0.5 OS Command Injection via PDF and Output Paths
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
revolunet pypdftk 0 ~ 0.5 -

II. Public POCs for CVE-2026-110636

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III. Intelligence Information for CVE-2026-110636

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Patches & Fixes for CVE-2026-110636 (1)

Other References for CVE-2026-110636 (3)

IV. Related Vulnerabilities

Same weakness: CWE-78

V. Comments for CVE-2026-110636

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