CVE-2023-39663
MathJax Regular expression Denial of Service (ReDoS)
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2023-39663- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-1333
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2023-39663- Updated
- 2026-11-02
EUVDEUVD-2023-2355 No score
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.
- Record
EUVD-2023-2355- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-v638-q856-grg8
MathJax Regular expression Denial of Service (ReDoS)
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.
- Record
GHSA-v638-q856-grg8- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-1333
- Updated
- 2026-11-02
OSVGHSA-v638-q856-grg8
MathJax Regular expression Denial of Service (ReDoS)
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.
- Record
GHSA-v638-q856-grg8- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-1333
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2023-39663
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.
- Record
UBUNTU-CVE-2023-39663- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSV No score
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.
- Record
CVE-2023-39663- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
mathjaxnpm |
through 2.7.9 | None known |
mathjaxUbuntu:14.04:LTS |
All versions, plus listed versions 2.2-12.3-1 |
None known |
mathjaxUbuntu:16.04:LTS |
All versions, plus listed versions 2.5.3-12.6.0-12.6.1-1 |
None known |
mathjaxUbuntu:18.04:LTS |
All versions, plus listed versions 2.7.0-2ubuntu12.7.2+dfsg-12.7.3+dfsg-1 |
None known |
mathjaxUbuntu:20.04:LTS |
All versions, plus listed versions 2.7.4+dfsg-1 |
None known |
mathjaxUbuntu:22.04:LTS |
All versions, plus listed versions 2.7.9+dfsg-1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-39663 is a high vulnerability (CVSS 7.5) in Mathjax, published August 29, 2023. Its validity is disputed. EPSS puts the chance of exploitation in the next 30 days at 0.82%, the 57th percentile.