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CVE-2023-39663

22
FAUCET Score

CVE-2023-39663 describes two Regular expression Denial of Service (ReDoS) vulnerabilities found in MathJax up to version 2.7.9, specifically within the components pattern and markdownPattern of MathJax.js. This vulnerability carries a CVSS score of 7.5 (High), indicating a network-based attack with low complexity that could lead to a denial of service, though the vendor disputes its exploitability due to the regular expressions not being applied to user input. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.7.9CPE matchmatch criteria
cpe:2.3:a:mathjax:mathjax:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.70%
Probability of exploitation in next 30 days
EPSS Percentile
49.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0070 is in the 25th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

npmGHSA-v638-q856-grg8high

MathJax Regular expression Denial of Service (ReDoS)

Aug 29, 2023

References

github.com / mathjax/MathJax/issues/3074
ExploitIssue TrackingVendor Advisory