Citrix NetScaler Out-of-Bounds Read Vulnerability

Citrix NetScaler

Citrix NetScaler ADC (formerly Citrix ADC), NetScaler Gateway (formerly Citrix Gateway) and NetScaler ADC FIPS and NDcPP contain an out-of-bounds reads vulnerability when configured as a SAML IDP leading to memory overread. Added to CISA KEV on 2026-03-30 (federal deadline 2026-04-02).

First seen: 30 Mar 2026
Last update: 30 Mar 2026, 12:00 UTC
Identifiers: CVE-2026-3055
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 Out-of-Bounds Read Vulnerability
Severity: high, exploited in the wild. Patch status: patched.
Affected: Citrix NetScaler
Ids: CVE-2026-3055

Citrix NetScaler ADC (formerly Citrix ADC), NetScaler Gateway (formerly Citrix Gateway) and NetScaler ADC FIPS and NDcPP contain an out-of-bounds reads vulnerability when configured as a SAML IDP leading to memory overread. Added to CISA KEV on 2026-03-30 (federal deadline 2026-04-02).

## 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-2026-3055") 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-2026-3055 https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300&articleURL=NetScaler_ADC_and_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_3055_and_CVE_2026_4368
https://pwned.coffee/i/citrix-netscaler-out-of-bounds-read-vulnerability-cve-2026-3055

Sources

Totalone hot coffee