Mathjax up to v2.7.9 was discovered to contain two Regular expression Denial of Service…
Priority HIGH 72CWE-1333Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-1333.
Summary
Mathjax up to v2.7.9 was discovered to contain two Regular expression Denial of Service (ReDoS) vulnerabilities in MathJax.js via the components pattern and markdownPattern. NOTE: the vendor disputes this because the regular expressions are not applied to user input; thus, there is no risk.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00819 57th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | mathjax (npm) | up to 2.7.9 | — | No fix listed | GHSA-v638-q856-grg8 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- mathjax (npm) Vendor— Affected up to 2.7.9 Fixed in — No fix listed GHSA-v638-q856-grg8
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-39663
- 2026-10-03 Alias added: GHSA-v638-q856-grg8
References
More Mathjax vulnerabilities
- TI-2018-16165 MathJax version prior to version 2.7.4 contains a Cross Site Scripting (XSS)… CVSS 3.0MEDIUM 5.4
Sources
- CVE-2023-39663 · CVE Program
- CVE-2023-39663 · NVD
- FIRST EPSS
- GHSA-v638-q856-grg8 · GitHub Advisory Database · CC BY 4.0
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