Buffer overflow in Px4 Px4-Autopilot
CVE-2026-84698
PX4 Autopilot contains a heap buffer overflow vulnerability in the sd_bench command that writes a four-byte block number into a user-supplied sized allocation. Attackers can invoke sd_bench with a block size below four bytes to overflow the heap buffer and potentially execute code or crash the system.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (36.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/PX4/PX4-Autopilot (product)
- github.com/PX4/PX4-Autopilot/blob/v1.17.0/src/systemcmds/sd_bench/sd_bench.cpp (technical-description)
- github.com/PX4/PX4-Autopilot/issues/28373 (issue-tracking)
- www.vulncheck.com/advisories/px4-autopilot-sd-bench-heap-buffer-overflow-via-bl… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-84698?
- CVE-2026-84698 is a medium-severity vulnerability in Px4 Px4-Autopilot, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2026-09-02.
- How severe is CVE-2026-84698?
- Medium severity. CVSS v3 base score is 6.5 out of 10.