Summary
PDF.js vulnerable to arbitrary JavaScript execution upon opening a malicious PDF
Workarounds
Set the option isEvalSupported to false.
References
Impact
If pdf.js is used to load a malicious PDF, and PDF.js is configured with isEvalSupported set to true (which is the default value), unrestricted attacker-controlled JavaScript will be executed in the context of the hosting domain.
CVE-2024-4367 has a CVSS score of 8.8 (High). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (4.2.67); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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The patch removes the use of eval:
https://github.com/mozilla/pdf.js/pull/18015
Frequently Asked Questions
- What is CVE-2024-4367? CVE-2024-4367 is a high-severity security vulnerability in pdfjs-dist (npm), affecting versions <= 4.1.392. It is fixed in 4.2.67.
- How severe is CVE-2024-4367? CVE-2024-4367 has a CVSS score of 8.8 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of pdfjs-dist are affected by CVE-2024-4367? pdfjs-dist (npm) versions <= 4.1.392 is affected.
- Is there a fix for CVE-2024-4367? Yes. CVE-2024-4367 is fixed in 4.2.67. Upgrade to this version or later.
- Is CVE-2024-4367 exploitable, and should I be worried? Whether CVE-2024-4367 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2024-4367 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2024-4367? Upgrade
pdfjs-distto 4.2.67 or later.