NIST deprecates RSA-2048 from 2030. Find every one of them before attackers do.
📦
📦 npm
Not in CISA KEV
MEDIUM severity

MathLive's Lack of Escaping of HTML allows for XSSGHSA-qwj6-q94f-8425

MEDIUMFix: arnog/mathlive@abc2605

GHSA-qwj6-q94f-8425 is a medium-severity (CVSS 6.3) Cross-site Scripting (XSS) vulnerability in mathlive. A fix is available for mathlive — see the affected versions and patch details below.

Also known asCVE-2025-29049
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for GHSA-qwj6-q94f-8425.

EPSS Exploitation Probability

via FIRST.org ↗
0.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs50th percentile — riskier than 50% of all scored CVEsHighest risk
0.00%0.38%0.75%1.13%0.5%0.6%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

290other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
mathlivenpm
433Kdownloads / week

Description

Summary

Despite normal text rendering as LaTeX expressions, preventing XSS, the library also provides users with commands which may modify HTML, such as the \htmlData command, and the lack of escaping leads to XSS.

Details

Overall in the code, other than in the test folder, no functions escaping HTML can be seen.

PoC

  1. Go to https://cortexjs.io/mathlive/demo/
  2. Paste either \htmlData{><img/onerror=alert(1)"src=}{} or \htmlData{x=" ><img/onerror=alert(1) src>}{} in the LaTeX textarea.

Impact

MathLive users who render untrusted mathematical expressions could encounter malicious input using \htmlData that runs arbitrary JavaScript, or generate invalid HTML.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmmathliveall versions0.104.0npm install mathlive@0.104.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mathlive, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update mathlive to 0.104.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-qwj6-q94f-8425 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Summary Despite normal text rendering as LaTeX expressions, preventing XSS, the library also provides users with commands which may modify HTML, such as the `\htmlData` command, and the lack of escaping leads to XSS. ### Details Overall in the code, other than in the `test` folder, no functions escaping HTML can be seen. ### PoC 1. Go to https://cortexjs.io/mathlive/demo/ 2. Paste either `\htmlData{><img/onerror=alert(1)"src=}{}` or `\htmlData{x=" ><img/onerror=alert(1) src>}{}` in the LaTeX textarea. ### Impact MathLive users who render untrusted mathematical expressions could encounte
O3 Security · Impact-Aware SCA

Is GHSA-qwj6-q94f-8425 in your dependencies?

Find it across npm, including transitive dependencies.

Scan my dependencies How O3 SCA works
MathLive's Lack of Escaping of HTML allows for XSS