Stack-data disclosure via unchecked SERIAL_CONTROL count
Published Jul 2, 2026 · Updated Jul 2, 2026
Out-of-bounds read in ArduPilot ArduPlane 4.6.3 and earlier allows remote attackers to disclose stack data via crafted MAVLink messages. GCS_MAVLINK::handle_serial_control() passes the wire-controlled SERIAL_CONTROL.count directly as the write length for the fixed 70-byte packet.data buffer, causing stream->write() to read and transmit bytes beyond the decoded array. No authentication or user interaction is required; the exposed MAVLink transport must accept the crafted message, and the demonstrated consequence is transmission of uninitialized stack bytes.
Summary
What happened
Out-of-bounds read in ArduPilot ArduPlane 4.6.3 and earlier allows remote attackers to disclose stack data via crafted MAVLink messages. GCS_MAVLINK::handle_serial_control() passes the wire-controlled SERIAL_CONTROL.count directly as the write length for the fixed 70-byte packet.data buffer, causing stream->write() to read and transmit bytes beyond the decoded array. No authentication or user interaction is required; the exposed MAVLink transport must accept the crafted message, and the demonstrated consequence is transmission of uninitialized stack bytes.
The record
- CVE
- CVE-2026-38971
- Published
- Jul 2, 2026
- Updated
- Jul 2, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-125
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 2, 2026CVE publishedPublication date reported by the CVE source.
- Jul 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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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.
Weakness, pattern, technique
Public exploit references
- Uninitialized Byte Propagation in ArduPilot's Live MAVLink SERIAL_CONTROL Forwarding Pathproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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