xhtml2pdf up to 0.2.18 pisa.startViewer os command injection

Summaryinfo

A vulnerability has been found in xhtml2pdf up to 0.2.18 and classified as problematic. The impacted element is the function pisa.startViewer. This manipulation causes os command injection. This vulnerability is handled as CVE-2026-110642. It is possible to launch the attack on the local host. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic was found in xhtml2pdf up to 0.2.18. Affected by this vulnerability is the function pisa.startViewer. The manipulation 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:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-110642 since 10/14/2026. The exploitation appears to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

Upgrading to version 0.2.19 eliminates this vulnerability.

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Productinfo

Name

• xhtml2pdf

Version

• 0.2.0
• 0.2.1
• 0.2.2
• 0.2.3
• 0.2.4
• 0.2.5
• 0.2.6
• 0.2.7
• 0.2.8
• 0.2.9
• 0.2.10
• 0.2.11
• 0.2.12
• 0.2.13
• 0.2.14
• 0.2.15
• 0.2.16
• 0.2.17
• 0.2.18

Website

• Product: https://github.com/xhtml2pdf/xhtml2pdf/

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