CVE-2024-4367 is a medium-severity (CVSS 5.6) CWE-754 vulnerability in pdfjs-dist. 17 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for pdfjs-dist — see the affected versions and patch details below.
PDF.js vulnerable to arbitrary JavaScript execution upon opening a malicious PDF
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA’s SSVC triage for CVE-2024-4367.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
pdfjs-distnpmDescription
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.
Patches
The patch removes the use of eval:
https://github.com/mozilla/pdf.js/pull/18015
Workarounds
Set the option isEvalSupported to false.
References
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | pdfjs-dist | all versions | 4.2.67npm install pdfjs-dist@4.2.67 |
Affected Products
debian linuxdebianfirefoxmozillathunderbirdmozillaopen-xchange appsuite frontendopen-xchangeResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Firefox ESR 115.11 - PDF.js Arbitrary JavaScript execution
by Milad karimi · Apr 22, 2025
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pdfjs-dist, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update pdfjs-dist to 4.2.67 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-4367 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Enterprise Linux 7 | firefox-0:115.11.0-1.el7_9 | RHSA-2024:2881 |
| Red Hat Enterprise Linux 7 | thunderbird-0:115.11.0-1.el7_9 | RHSA-2024:2913 |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | webkitgtk4-0:2.52.5-1.el7_9 | RHSA-2026:58564 |
| Red Hat Enterprise Linux 8 | firefox-0:115.11.0-1.el8_10 | RHSA-2024:3783 |
| Red Hat Enterprise Linux 8 | thunderbird-0:115.11.0-1.el8_10 | RHSA-2024:3784 |
| Red Hat Enterprise Linux 8 | webkit2gtk3-0:2.52.5-1.el8_10 | RHSA-2026:42088 |
| Red Hat Enterprise Linux 8.2 Advanced Update Support | firefox-0:115.11.0-1.el8_2 | RHSA-2024:2882 |
| Red Hat Enterprise Linux 8.2 Advanced Update Support | thunderbird-0:115.11.0-1.el8_2 | RHSA-2024:3338 |
Frequently Asked Questions
Is CVE-2024-4367 in your dependencies?
Find it across npm, including transitive dependencies.