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Exploitation reportedNot in CISA KEV yetFix available

CVE-2024-4367

Exploitation reported by one source. First attested on 2026-04-15 by GCVE · kevintel.

  • Published2024-05-14
  • Fixed in126.0 · 126 · 115.11.0
  • WeaknessCWE-754

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2024-05-1418:15CVE publishedNVD
  2. 2025-04-22Exploit-DB entryExploit-DB
  3. 2026-04-1514:28Listed as exploited by GCVEGCVE
  4. 2026-04-1514:28Exploitation first reportedGCVE

Versions per branch

NVD · CISA-ADP
Mozilla firefox
BranchAffectedFixed in
126.0< 126.0126.0
126.x< 126126
115.11< 115.11.0115.11.0
Mozilla thunderbird
BranchAffectedFixed in
115.11< 115.11.0115.11.0
115.11< 115.11115.11
Open-xchange open-xchange appsuite frontend
BranchAffectedFixed in
7.10< 7.10.67.10.6
7.10= 7.10.6no fix published

3 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA3 products

As mozilla, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Mozilla Firefox
    Affected
    • < 126fixed in 126custom
  • Mozilla Firefox ESR
    Affected
    • < 115.11fixed in 115.11custom
  • Mozilla Thunderbird
    Affected
    • < 115.11fixed in 115.11custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2024-06-10

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • @rootio/pdfjs-distRoot:npmall versions · fixed in 2.2.0-root.io.1
  • @rootio/pdfjs-distRoot:npmall versions · fixed in 2.12.0-root.io.1
  • @rootio/pdfjs-distRoot:npmall versions · fixed in 2.12.313-root.io.2
  • @rootio/pdfjs-distRoot:npmall versions · fixed in 2.16.105-root.io.2
  • @rootio/pdfjs-distRoot:npmall versions · fixed in 2.2.228-root.io.2
  • @rootio/pdfjs-distRoot:npmall versions · fixed in 2.2.228-root.io.3
  • @rootio/pdfjs-distRoot:npmall versions · fixed in 3.11.0-root.io.1
  • @rootio/pdfjs-distRoot:npmall versions · fixed in 3.11.174-root.io.2

125 more package ranges on OSV.dev

Vendor advisories

  • CVE-2024-4367 Red Hat Product Security605 products fixed · 10 known affected

    Mozilla: Arbitrary JavaScript execution in PDF.js

    firefox as a component of Red Hat Enterprise Linux 6 · firefox.src as a component of Red Hat Enterprise Linux 6 · pywebkitgtk.src as a component of Red Hat Enterprise Linux 6 · +7 more

  • RHSA-2026:59326 Red Hat Product Security47 products fixed

    Red Hat Security Advisory: webkit2gtk3 security update

  • RHSA-2026:59325 Red Hat Product Security38 products fixed

    Red Hat Security Advisory: webkit2gtk3 security update

  • RHSA-2026:58564 Red Hat Product Security18 products fixed

    Red Hat Security Advisory: webkitgtk4 security update

  • RHSA-2026:58550 Red Hat Product Security46 products fixed

    Red Hat Security Advisory: webkit2gtk3 security update

  • RHSA-2026:57348 Red Hat Product Security38 products fixed

    Red Hat Security Advisory: webkit2gtk3 security update

24 more advisories

Full record on NVD

Fix

  1. Update Mozilla firefox to 126.0 · 126 · 115.11.0
  2. Vendor fix Red Hat Product Security RHSA-2026:59326 · 47 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix CISA ICSA-26-134-04 · 1 productUpdate to V2312.0009 or later version
  4. Vendor fix CISA ICSA-26-134-04 · 1 productUpdate to V2406.0006 or later version
  5. Vendor fix Siemens ProductCERT SSA-827383 · 1 productUpdate to V2312.0009 or later version
  6. Vendor fix Siemens ProductCERT SSA-827383 · 1 productUpdate to V2406.0006 or later version
  7. Vendor fix Red Hat Product Security RHSA-2024:3784 · 13 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
EDB-52273
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2024-05-14
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-wgrm-67xf-hhpq

Frequently asked questions

What is 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. This vulnerability affects Firefox < 126, Firefox ESR < 115.11, and Thunderbird < 115.11.

Is CVE-2024-4367 actively exploited?

A proof-of-concept exploit exists for CVE-2024-4367, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2024-4367?

CVE-2024-4367 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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