# CVE-2026-76721: Unauthenticated Buffer Overflow Vulnerability leads to Remote Code Execution in HPE Networking Instant ON APs

> Unauthenticated remote attackers can exploit a buffer overflow in HPE Instant ON APs to execute arbitrary code with privileged access.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Sep 2026
- **Updated:** 30 Sep 2026
- **Also known as:** GHSA-pw85-jqmm-v352

## What is CVE-2026-76721?

CVE-2026-76721 is a critical memory corruption vulnerability in Hewlett Packard Enterprise (HPE) Instant ON, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Buffer overflow vulnerability exists in the affected interface of HPE Networking Instant ON that could allow an unauthenticated remote attacker to run arbitrary code on the underlying host. Successful exploitation could allow an attacker to execute arbitrary code as a privileged user on the underlying operating system.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-76721?


## How do I fix CVE-2026-76721?

No fix has been published for CVE-2026-76721 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-76721 being exploited?

There is no known exploitation of CVE-2026-76721 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-76721 and fix it if it is affected.

What it is: CVE-2026-76721 is a critical memory corruption vulnerability in Hewlett Packard Enterprise (HPE) Instant ON, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-76721 in the wild and no public exploit code.

Affected product: Hewlett Packard Enterprise (HPE) Instant ON. 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-2026-76721/ (Markdown: https://insights.sbomify.com/CVE-2026-76721/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-76721
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-76721
- OSV: https://osv.dev/vulnerability/CVE-2026-76721

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-76721/
Summaries are generated and may contain mistakes; the official description above is the record.