CVE-2026-84698Public exploitHinoki check available

System crash via undersized sd_bench block allocation

Published Sep 2, 2026 · Updated Sep 2, 2026

Heap buffer overflow in PX4 Autopilot 1.17.0 and earlier allows attackers to crash the system through the sd_bench command. sd_bench allocates exactly the requested block size, then write_test stores a four-byte block number at its start without requiring at least four bytes. The command must be compiled in, and command access through a PX4 shell or MAVLink channel is required; block sizes of one to three bytes corrupt the heap.

CVSS severity7.1
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Heap buffer overflow in PX4 Autopilot 1.17.0 and earlier allows attackers to crash the system through the sd_bench command. sd_bench allocates exactly the requested block size, then write_test stores a four-byte block number at its start without requiring at least four bytes. The command must be compiled in, and command access through a PX4 shell or MAVLink channel is required; block sizes of one to three bytes corrupt the heap.

The record

CVE
CVE-2026-84698
Published
Sep 2, 2026
Updated
Sep 2, 2026
Vendor
PX4
Product
PX4 Autopilot
Classifications
CWE-787, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.17.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

PX4 · PX4 Autopilotversion=0 <=1.17.0

Published CVSS scores

7.1VulnCheck CNACVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5VulnCheck CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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