CVE-2024-34342Public exploitNetwork attack vector

JavaScript execution via unquoted PDF FontMatrix

Published May 7, 2024 · Updated Aug 2, 2024

Code injection in React-PDF before 7.7.3 and 8.0.0 through 8.0.1 allows remote attackers to run JavaScript via a malicious PDF. PDF.js accepts a nonnumeric FontMatrix entry from a PDF font dictionary, joins it unquoted into a generated glyph-rendering Function body, and evaluates it. A victim must open the PDF while isEvalSupported remains enabled, allowing script execution in the hosting origin; strict CSP or disabled evaluation blocks the path.

CVSS severity7.1
High
EPSS probability1.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in React-PDF before 7.7.3 and 8.0.0 through 8.0.1 allows remote attackers to run JavaScript via a malicious PDF. PDF.js accepts a nonnumeric FontMatrix entry from a PDF font dictionary, joins it unquoted into a generated glyph-rendering Function body, and evaluates it. A victim must open the PDF while isEvalSupported remains enabled, allowing script execution in the hosting origin; strict CSP or disabled evaluation blocks the path.

The record

CVE
CVE-2024-34342
Published
May 7, 2024
Updated
Aug 2, 2024
Vendor
Mozilla
Product
PDF.js
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 7.7.3, >= 8.0.0, < 8.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · PDF.jsversion=< 7.7.3, >= 8.0.0, < 8.0.2
Wojciech Maj · React-PDFversion=< 7.7.3; version=>= 8.0.0, < 8.0.2

Published CVSS scores

7.1GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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