# CVE-2026-54705: Arno Gourdol MathLive XSS in text-mode rendering

Source: https://junglewise.ai/threats/cve-2026-54705-arno-gourdol-mathlive-xss-in-text-mode-rendering  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-29. Updated: 2026-07-29  
License: CC BY 4.0 with a link back

CVE-2026-54705 · Severity: medium · CVSS 6.3 · Published 2026-07-29

MathLive is a web component library used to display and edit mathematical formulas on websites. A security flaw allows attackers to embed malicious code within math expressions that, when rendered by the library, can execute arbitrary JavaScript in a user's browser. This could lead to unauthorized actions being performed on behalf of users or the theft of sensitive session information.

Technologies: [mathlive (npm)](https://junglewise.ai/threats/technologies/mathlive). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-54705 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-54705 being exploited in the wild.

**How severe is CVE-2026-54705?** Medium severity, with a CVSS score of 6.3, published 29 July 2026.

**Which products and versions are affected?** mathlive (npm) <= 0.109.2, SEMVER:introduced=0,fixed=0.110.0.

**Is there a fix for CVE-2026-54705?** Yes. mathlive (npm): upgrade to 0.110.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-54705 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-54705?** Check whether you run mathlive (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- mathlive (npm): upgrade to 0.110.0 or later

  ```sh
  npm install mathlive@0.110.0
  ```


## Technical details

A cross-site scripting (XSS) vulnerability exists in MathLive due to improper output escaping of text-mode content within commands like \\text{} and \\mbox{}. The root cause is located in Box.toMarkup and the MathML serializer, where raw characters are concatenated into the final markup without being passed through an HTML/XML escaping function. This allows an attacker to provide LaTeX input containing malicious HTML tags (e.g., <img src=x onerror=alert(1)>) that are executed when the output is inserted into the DOM via sinks like innerHTML. The vulnerability affects several public APIs including convertLatexToMarkup, convertLatexToMathMl, and static elements like <math-span>. The issue is fixed in version 0.110.0 by implementing proper escaping for text-mode atoms.

## Affected products

- arnog mathlive < 0.110.0

## Identifiers

- CVE-2026-54705
- GHSA-fm7p-gw32-828p

## Timeline

- 2026-05-29: disclosed: Issue first reported to vendor
- 2026-06-08: patched: Fix committed to repository
- 2026-06-09: advisory: GitHub Security Advisory published
- 2026-07-29: advisory: NVD published CVE-2026-54705

## References

- [https://github.com/arnog/mathlive/commit/5fe1c46153883f9ec0249a5c8c34e64aaae9cfb8](https://github.com/arnog/mathlive/commit/5fe1c46153883f9ec0249a5c8c34e64aaae9cfb8)
- [https://github.com/arnog/mathlive/issues/3028](https://github.com/arnog/mathlive/issues/3028)
- [https://github.com/arnog/mathlive/security/advisories/GHSA-fm7p-gw32-828p](https://github.com/arnog/mathlive/security/advisories/GHSA-fm7p-gw32-828p)

## Related threats

- [MathLive XSS vulnerability in HTML escaping](https://junglewise.ai/threats/mathlive-xss-vulnerability-in-html-escaping-b78bd139)
- [MathLive HTML escaping vulnerability in \htmlData command](https://junglewise.ai/threats/cve-2025-29049-mathlive-html-escaping-vulnerability-in-htmldata-command)