Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability

Citrix NetScaler

Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for remote code execution or denial of service Can be chained with CVE-2026-88771. Added to CISA KEV on 2026-09-27 (federal deadline 2026-09-30).

First seen: 27 Sept 2026
Last update: 27 Sept 2026, 12:00 UTC
Identifiers: CVE-2026-88771
CVE-2026-88772
Source: CISA KEV
On the menu as: VPN & firewalls

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
Severity: high, exploited in the wild. Patch status: patched.
Affected: Citrix NetScaler
Ids: CVE-2026-88771, CVE-2026-88772

Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for remote code execution or denial of service Can be chained with CVE-2026-88771. Added to CISA KEV on 2026-09-27 (federal deadline 2026-09-30).

## Steps
1. This touches infrastructure (vpn-edge). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-88771") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://nvd.nist.gov/vuln/detail/CVE-2026-88771 https://nvd.nist.gov/vuln/detail/CVE-2026-88772 https://support.citrix.com/external/article/CTX694799/steps-to-take-if-netscaler-adc-is-suspec.html https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096
https://pwned.coffee/i/citrix-netscaler-improper-restriction-of-operations-within-the-bounds-of

Sources

Totalone hot coffee