CVE-2026-16633: PDF.js: Arbitrary JavaScript execution upon opening a malicious PDF

August 6, 2026

If PDF.js is used to load a malicious PDF, and PDF.js is configured with enableScripting set to true (which is the default value) and no CSP for disallowing script-src, unrestricted attacker-controlled JavaScript will be executed in the context of the hosting domain.

References

bugzilla.mozilla.org/show_bug.cgi?id=2055885
github.com/advisories/GHSA-hq66-cqwq-w95j
github.com/mozilla/pdf.js/security/advisories/GHSA-hq66-cqwq-w95j
nvd.nist.gov/vuln/detail/CVE-2026-16633

Code Behaviors & Features

Detect and mitigate CVE-2026-16633 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →