# CVE-2026-0243: Prisma SD-WAN: Denial of Service (DoS) Vulnerability Through IPv6 Crafted Packet

> An unauthenticated network-adjacent attacker can cause system disruption on Prisma SD-WAN ION devices by sending a specially crafted IPv6 packet.

- **Severity:** Medium 4.9 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:U/AU:Y/R:U/V:D/RE:M/U:Amber`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 May 2026
- **Updated:** 14 May 2026
- **Also known as:** GHSA-j263-ghj6-w2q7

## What is CVE-2026-0243?

CVE-2026-0243 is a medium-severity denial of service vulnerability in Palo Alto Networks Prisma SD-WAN ION, published on 13 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A denial of service (DoS) vulnerability in Palo Alto Networks Prisma SD-WAN ION devices enables an unauthenticated attacker in a network adjacent to a Prisma SD-WAN ION device to cause a system disruption by sending a specially crafted IPv6 packet.

Weakness: CWE-606 (Unchecked Input for Loop Condition)

## Which versions are affected by CVE-2026-0243?

It affects 1 product.


Products: Paloaltonetworks Prisma Sd-Wan.

## How do I fix CVE-2026-0243?

No fix has been published for CVE-2026-0243 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-0243 being exploited?

There is no known exploitation of CVE-2026-0243 in the wild and no public exploit code.

## Other vulnerabilities in Palo Alto Networks Prisma SD-WAN ION

- [CVE-2026-0244](https://insights.sbomify.com/CVE-2026-0244/): Prisma SD-WAN: Improper Certificate Validation Vulnerability (medium 5.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-0243 and fix it if it is affected.

What it is: CVE-2026-0243 is a medium-severity denial of service vulnerability in Palo Alto Networks Prisma SD-WAN ION, published on 13 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-0243 in the wild and no public exploit code.

Affected product: Palo Alto Networks Prisma SD-WAN ION. 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-2026-0243/ (Markdown: https://insights.sbomify.com/CVE-2026-0243/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-0243
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-0243
- OSV: https://osv.dev/vulnerability/CVE-2026-0243

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-0243/
Summaries are generated and may contain mistakes; the official description above is the record.