# CVE-2026-3606: Ettercap etterfilter ef_output.c add_data_segment out-of-bounds

> A local attacker can trigger an out-of-bounds read in Ettercap's etterfilter component, potentially causing a crash or arbitrary code execution.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Mar 2026
- **Updated:** 9 Mar 2026
- **Also known as:** DEBIAN-CVE-2026-3606, GHSA-2cjg-466r-p8w4, UBUNTU-CVE-2026-3606

## What is CVE-2026-3606?

CVE-2026-3606 is a medium-severity memory corruption vulnerability in Ettercap, published on 5 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability has been found in Ettercap 0.8.4-Garofalo. Affected by this vulnerability is the function add_data_segment of the file src/ettercap/utils/etterfilter/ef_output.c of the component etterfilter. The manipulation leads to out-of-bounds read. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Weakness: CWE-125 (Out-of-bounds Read), CWE-787 (Out-of-bounds Write), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-3606?

It affects 1 product.


Products: Ettercap-Project Ettercap.

## How do I fix CVE-2026-3606?

No fix has been published for CVE-2026-3606 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3606 being exploited?

There is no known exploitation of CVE-2026-3606 in the wild and no public exploit code.

## Other vulnerabilities in Ettercap

- [CVE-2010-3843](https://insights.sbomify.com/CVE-2010-3843/): Memory corruption in ettercap (high 7.8)
- [CVE-2014-6395](https://insights.sbomify.com/CVE-2014-6395/): Memory corruption in n/a (high 7.5)
- [CVE-2014-6396](https://insights.sbomify.com/CVE-2014-6396/): Memory corruption in n/a (high 7.5)
- [CVE-2014-9376](https://insights.sbomify.com/CVE-2014-9376/): Integer overflow in n/a (high 7.5)
- [CVE-2014-9377](https://insights.sbomify.com/CVE-2014-9377/): Memory corruption in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3606 and fix it if it is affected.

What it is: CVE-2026-3606 is a medium-severity memory corruption vulnerability in Ettercap, published on 5 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-3606 in the wild and no public exploit code.

Affected product: Ettercap. 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-2026-3606/ (Markdown: https://insights.sbomify.com/CVE-2026-3606/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3606
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3606
- OSV: https://osv.dev/vulnerability/CVE-2026-3606

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3606/
Summaries are generated and may contain mistakes; the official description above is the record.