# CVE-2026-3055: Citrix NetScaler Out-of-Bounds Read

> Attackers can read sensitive memory contents from NetScaler devices configured as SAML IDPs due to insufficient input validation.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L`)
- **Exploited in the wild:** Yes, since 30 Mar 2026 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Mar 2026
- **Updated:** 31 Mar 2026
- **Also known as:** GHSA-wv7p-q4p2-p6pf

## What is CVE-2026-3055?

CVE-2026-3055 is a critical vulnerability in NetScaler ADC, published on 23 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-3055?

It affects 2 products.


Products: Citrix NetScaler ADC, Citrix Netscaler Gateway.

## How do I fix CVE-2026-3055?

No fix has been published for CVE-2026-3055 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 2 Apr 2026.

## Is CVE-2026-3055 being exploited?

Yes. Attackers have exploited CVE-2026-3055 in the wild since at least 30 Mar 2026.

Public exploit code:

- PoC de CVE-2026-3055: memory overread en Citrix NetScaler ADC/Gateway para filtrar session IDs. (github_poc): https://github.com/fevar54/CVE-2026-3055---Citrix-NetScaler-Memory-Overread-PoC
- Scanner de CVE-2026-3055: detecta NetScaler ADC/Gateway vulnerables a memory overread. Reportes JSON/HTML/CSV. (github_poc): https://github.com/fevar54/CVE-2026-3055-Scanner---Herramienta-de-Detecci-n
- Low-impact probe for Citrix NetScaler CVE-2026-3055 (SAML IdP memory overread) (github_poc): https://github.com/l0lsec/check-cve-2026-3055-netscaler
- Citrix ADC (NetScaler) CVE-2026-3055 Scanner (metasploit)
- CVE-2026-3055 (github_poc): https://github.com/0xredash/CVE-2026-3055
- https://github.com/NetVanguard-cmd/CVE-2026-3055 (github_poc): https://github.com/NetVanguard-cmd/CVE-2026-3055

## Other vulnerabilities in NetScaler ADC

- [CVE-2023-3519](https://insights.sbomify.com/CVE-2023-3519/): Citrix NetScaler ADC and NetScaler Gateway Code Injection (critical 9.8, exploited in the wild)
- [CVE-2026-88771](https://insights.sbomify.com/CVE-2026-88771/): Citrix NetScaler Improper Input Validation (critical 9.5, exploited in the wild)
- [CVE-2026-88772](https://insights.sbomify.com/CVE-2026-88772/): Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer (critical 9.5, exploited in the wild)
- [CVE-2023-4966](https://insights.sbomify.com/CVE-2023-4966/): Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow (critical 9.4, exploited in the wild)
- [CVE-2026-19490](https://insights.sbomify.com/CVE-2026-19490/): Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel (critical 9.3, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3055 and fix it if it is affected.

What it is: CVE-2026-3055 is a critical vulnerability in NetScaler ADC, published on 23 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2026-3055 in the wild since at least 30 Mar 2026.

Affected product: NetScaler ADC. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-3055/ (Markdown: https://insights.sbomify.com/CVE-2026-3055/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3055
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3055
- OSV: https://osv.dev/vulnerability/CVE-2026-3055

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3055/
Summaries are generated and may contain mistakes; the official description above is the record.