by Kastro
Paper/Archive/CVE-2026-110636

CVE-2026-110636

revolunet pypdftk — pypdftk through 0.5 OS Command Injection via PDF and Output Paths

EPSS 3%public exploitCVSS 9.8
critical.is priorityof 100
57
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 85.8.858 × 2017.2Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
pypdftk≤ 0.5–CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/revolunet/pypdftk/issues/56patchgithub.com/revolunet/pypdftk/pull/57writeupgithub.com/revolunet/pypdftk/blob/1d3b40c3b42fb3cc6b0192d34aba2c21a1efd369/pypdftk.py#L87-L123refgithub.com/revolunet/pypdftkwriteupvulncheck.com/advisories/pypdftk-through-0.5-os-command-injection-via-pdf-and-output-paths