revolunet pypdftk Os Command Injection Flaw (CVE-2026-110636) Rated CVSS 9.3
A newly published critical vulnerability in revolunet pypdftk carries a CVSS score of 9.3. Here is what is affected and how to respond.
Key points
- CVE-2026-110636 affects revolunet pypdftk.
- CVSS 9.3 (Critical).
- No exploitation confirmed yet.
A critical OS command injection tracked as CVE-2026-110636 has been published in the National Vulnerability Database for revolunet pypdftk, with a CVSS base score of 9.3.
At a glance
- CVE
- CVE-2026-110636
- Product
- revolunet pypdftk
- CVSS
- 9.3 Critical
- Weakness
- OS command injection
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: 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 versions
| Vendor | Product | Versions |
|---|---|---|
| Revolunet | pypdftk | up to 0.5 |
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
What to do and how to stay safe: CVE-2026-110636
- Vulnerability severity scores ignore your specific architecture and context.
- Exploitability depends on network exposure and user behavior, not just code flaws.
- Prioritization requires continuous asset inventory and threat intelligence alignment.
Risk-based vulnerability management focuses your limited resources on the flaws that actually threaten your business. Start by mapping your critical assets and checking for active exploits to prioritize your backlog.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-110636?
CVE-2026-110636 is a OS command injection vulnerability in revolunet pypdftk.
How severe is CVE-2026-110636?
It has a CVSS score of 9.3 Critical.
Is CVE-2026-110636 being exploited?
There is no public confirmation of exploitation at the time of publication.
