Service interruption via undersized float conversion buffer
Published Sep 11, 2026 · Updated Sep 11, 2026
Stack-based buffer overflow in Arduino AVR Boards before 1.8.8 allows attackers to corrupt memory by concatenating extreme floats. The affected String concatenation methods pass near-limit float or double values to dtostrf(), which writes past a fixed-size stack buffer. Exploitation requires a sketch to process attacker-influenced values; the corruption interrupts service and enables code execution under specific conditions.
Summary
What happened
Stack-based buffer overflow in Arduino AVR Boards before 1.8.8 allows attackers to corrupt memory by concatenating extreme floats. The affected String concatenation methods pass near-limit float or double values to dtostrf(), which writes past a fixed-size stack buffer. Exploitation requires a sketch to process attacker-influenced values; the corruption interrupts service and enables code execution under specific conditions.
The record
- CVE
- CVE-2026-48490
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Vendor
- Arduino
- Product
- Arduino AVR Boards
- Classifications
- CWE-120
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 11, 2026CVE publishedPublication date reported by the CVE source.
- Sep 11, 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.
- Affected versionversion=< 1.8.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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