RCE in Xhtml2pdf
CVE-2026-110642
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/xhtml2pdf/xhtml2pdf/pull/835 (issue-tracking, patch)
- github.com/xhtml2pdf/xhtml2pdf/commit/f86380dad15b3a6810201d08755a3ee6b19d5063 (patch)
- github.com/xhtml2pdf/xhtml2pdf/releases/tag/v0.2.19 (release-notes)
- github.com/xhtml2pdf/xhtml2pdf/blob/v0.2.18/xhtml2pdf/pisa.py (technical-description)
- www.vulncheck.com/advisories/xhtml2pdf-before-0.2.19-os-command-injection-via-s… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110642?
- CVE-2026-110642 is a high-severity vulnerability in Xhtml2pdf, classified under OS Command Injection. CVSS score: 7.8/10. Published 2026-10-14.
- How severe is CVE-2026-110642?
- High severity. CVSS v3 base score is 7.8 out of 10.