CVE-2026-110642

7.8High

Published 14 Oct 2026 · NVD status: Deferred · AI triage by gemini-3.8-flash

7.8High

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required
Impact: Full C/I/A compromise
Weakness: CWE-78

Impact

Attackers can execute arbitrary OS commands as the local user if they trick someone into processing a maliciously named file. This requires the user to run the pisa tool with the -s or --start-viewer flag.

Root cause

The pisa.startViewer() function interpolates unescaped file names directly into an os.system call.

Affected systems

xhtml2pdf before 0.2.19

CVSS v3.1 · CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Fix & remediation

Upgrade xhtml2pdf to version 0.2.19 or higher. As an interim mitigation, do not use the -s or --start-viewer CLI flags.

shell

$ pip install --upgrade 'xhtml2pdf>=0.2.19'

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

Ad · In-content banner

NVD description

xhtml2pdf before 0.2.19 contains an OS command injection vulnerability in pisa.startViewer() that allows attackers to execute commands by interpolating unescaped file names into os.system. Attackers can supply an input file whose name contains a double quote and shell metacharacters, which runs OS commands as the invoking user when the pisa tool is used with -s/--start-viewer.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-110642