# CVE-2026-89088: Parted: parted: denial of service via heap buffer overflow during fat16 resize

> An attacker can cause a denial of service by tricking a user into resizing a malicious FAT16 image, triggering a heap buffer overflow in parted.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 16 Oct 2026
- **Updated:** 19 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-89088, ECHO-f23f-a455-73fe, GHSA-phmc-786q-m6fp, OESA-2026-4171, OESA-2026-4172, OESA-2026-4173, OESA-2026-4174, UBUNTU-CVE-2026-89088

## What is CVE-2026-89088?

CVE-2026-89088 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 16 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

A flaw was found in parted. A heap-based buffer overflow exists in libparted's file system resizing logic when handling FAT16 volumes. By convincing a user or administrator to resize a specially crafted FAT16 file system image with malformed directory metadata, an attacker can trigger an oversized read into a fixed-size memory buffer. This issue causes memory corruption, resulting in an application crash and a denial of service (DoS).

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

## Which versions are affected by CVE-2026-89088?


## How do I fix CVE-2026-89088?

Apply the vendor's patch.

## Is CVE-2026-89088 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89088 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89088 and fix it if it is affected.

What it is: CVE-2026-89088 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 16 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89088 exists.

Affected product: Red Hat Enterprise Linux 10. 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-2026-89088/ (Markdown: https://insights.sbomify.com/CVE-2026-89088/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89088
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89088
- OSV: https://osv.dev/vulnerability/CVE-2026-89088

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-89088/
Summaries are generated and may contain mistakes; the official description above is the record.