# CVE-2020-26422: Memory corruption in Wireshark

> A buffer overflow in the QUIC dissector allows attackers to cause a denial of service via crafted packets or capture files.

- **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-f986-fpv9-3cm7, UBUNTU-CVE-2020-26422

## What is CVE-2020-26422?

CVE-2020-26422 is a low-severity memory corruption vulnerability in Oracle Zfs Storage Appliance Kit, published on 21 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Buffer overflow in QUIC dissector in Wireshark 3.4.0 to 3.4.1 allows denial of service via packet injection or crafted capture file

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2020-26422?

It affects 2 products.


Products: Oracle Zfs Storage Appliance Kit, Wireshark Wireshark.

## How do I fix CVE-2020-26422?

Upgrade to a fixed version.

## Is CVE-2020-26422 being exploited?

There is no known exploitation of CVE-2020-26422 in the wild and no public exploit code.

## Other vulnerabilities in Oracle Zfs Storage Appliance Kit

- [CVE-2022-21513](https://insights.sbomify.com/CVE-2022-21513/): Privilege escalation in Sun ZFS Storage Appliance Kit (AK) Software (high 8.2)
- [CVE-2025-62290](https://insights.sbomify.com/CVE-2025-62290/): Auth bypass in Oracle ZFS Storage Appliance Kit (high 7.2)
- [CVE-2024-21104](https://insights.sbomify.com/CVE-2024-21104/): Privilege escalation in Sun ZFS Storage Appliance Kit (AK) Software (medium 6.5)
- [CVE-2025-53046](https://insights.sbomify.com/CVE-2025-53046/): Denial of service in Oracle ZFS Storage Appliance Kit (medium 4.9)
- [CVE-2025-62289](https://insights.sbomify.com/CVE-2025-62289/): Denial of service in Oracle ZFS Storage Appliance Kit (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-26422 and fix it if it is affected.

What it is: CVE-2020-26422 is a low-severity memory corruption vulnerability in Oracle Zfs Storage Appliance Kit, published on 21 Dec 2020. 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-2020-26422 in the wild and no public exploit code.

Affected product: Oracle Zfs Storage Appliance Kit. 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-2020-26422/ (Markdown: https://insights.sbomify.com/CVE-2020-26422/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-26422
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-26422
- OSV: https://osv.dev/vulnerability/CVE-2020-26422

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-26422/
Summaries are generated and may contain mistakes; the official description above is the record.