CVE-2026-84698: PX4 Autopilot sd_bench Heap Buffer Overflow via Block Size

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-02 · updated 2026-09-10
Weakness: CWE-787

Description

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.

Affected products

PX4-Autopilot: through 1.17.0

References

https://github.com/PX4/PX4-Autopilot
https://github.com/PX4/PX4-Autopilot/blob/v1.17.0/src/systemcmds/sd_bench/sd_bench.cpp
https://github.com/PX4/PX4-Autopilot/issues/28373
https://www.vulncheck.com/advisories/px4-autopilot-sd-bench-heap-buffer-overflow-via-block-size
https://github.com/PX4/PX4-Autopilot/issues/28373

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