# CVE-2026-6069: CVE-2026-6069

> A stack-based buffer overflow in NASM's disassembly function allows attackers to trigger out-of-bounds writes, potentially leading to code execution or crashes.

- **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:** 10 Apr 2026
- **Updated:** 10 Apr 2026
- **Also known as:** DEBIAN-CVE-2026-6069, GHSA-pfc2-7mmr-x54w, UBUNTU-CVE-2026-6069

## What is CVE-2026-6069?

CVE-2026-6069 is a high-severity memory corruption vulnerability in Nasm Netwide Assembler, published on 10 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

NASM’s disasm() function contains a stack based buffer overflow when formatting disassembly output, allowing an attacker triggered out-of-bounds write when `slen` exceeds the buffer capacity.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2026-6069?

It affects 1 product.


Products: Nasm Netwide Assembler.

## How do I fix CVE-2026-6069?

No fix has been published for CVE-2026-6069 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-6069 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6069 exists.

## Other vulnerabilities in Nasm Netwide Assembler

- [CVE-2004-1287](https://insights.sbomify.com/CVE-2004-1287/): Memory corruption in n/a (critical 10.0)
- [CVE-2020-24978](https://insights.sbomify.com/CVE-2020-24978/): Use after free in n/a (critical 9.8)
- [CVE-2008-7177](https://insights.sbomify.com/CVE-2008-7177/): Memory corruption in n/a (critical 9.3)
- [CVE-2023-31722](https://insights.sbomify.com/CVE-2023-31722/): Memory corruption in n/a (high 7.8)
- [CVE-2022-44370](https://insights.sbomify.com/CVE-2022-44370/): Memory corruption in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-6069 and fix it if it is affected.

What it is: CVE-2026-6069 is a high-severity memory corruption vulnerability in Nasm Netwide Assembler, published on 10 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6069 exists.

Affected product: Nasm Netwide Assembler. 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-2026-6069/ (Markdown: https://insights.sbomify.com/CVE-2026-6069/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-6069
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6069
- OSV: https://osv.dev/vulnerability/CVE-2026-6069

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-6069/
Summaries are generated and may contain mistakes; the official description above is the record.