# CVE-2026-76663: HPE NonStop TELSERV - Memory corruption vulnerability

> A stack-based buffer overflow in HPE NonStop TELSERV allows attackers to cause memory corruption and denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 15 Oct 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-9rwj-hh6p-x6gp

## What is CVE-2026-76663?

CVE-2026-76663 is a high-severity memory corruption vulnerability in Hewlett Packard Enterprise HPE NonStop TELSERV, published on 15 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A stack-based buffer overflow vulnerability in HPE NonStop TELSERV can cause memory corruption that may result in DoS.

Weakness: CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2026-76663?


## How do I fix CVE-2026-76663?

No fix has been published for CVE-2026-76663 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-76663 being exploited?

There is no known exploitation of CVE-2026-76663 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-76663 and fix it if it is affected.

What it is: CVE-2026-76663 is a high-severity memory corruption vulnerability in Hewlett Packard Enterprise HPE NonStop TELSERV, published on 15 Oct 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-2026-76663 in the wild and no public exploit code.

Affected product: Hewlett Packard Enterprise HPE NonStop TELSERV. 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-2026-76663/ (Markdown: https://insights.sbomify.com/CVE-2026-76663/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-76663
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-76663
- OSV: https://osv.dev/vulnerability/CVE-2026-76663

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-76663/
Summaries are generated and may contain mistakes; the official description above is the record.