CVE-2026-48490
ArduinoCore-AVR: Stack-Based Buffer Overflow in String float/double concatenation handler
Published Sep 11, 2026
CVSS 4.0 · 6.9 Medium
EPSS < 1%
KEV · Not listed
Description
ArduinoCore-avr contains the source code and configuration files of the Arduino AVR Boards platform. A vulnerability in versions prior to 1.8.8 allows an attacker to trigger a stack-based buffer overflow when concatenating floating-point values of sufficiently large magnitude onto an Arduino String object. By passing values near the extremes of the float or double range to `String::concat(float)`, `String::concat(double)`, `String::operator+=()`, or the `+` operator with a float/double operand, `dtostrf()` writes beyond the fixed-size stack buffer, causing memory corruption and denial of service. Under specific conditions, this could enable arbitrary code execution on AVR-based Arduino boards. The fix is included starting from the `1.8.8 `release.
Affected Products
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CVE record
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NVD configurations
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Red Hat packages
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OpenCVE enrichment
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
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| arduino | ArduinoCore-avr | affected |
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| Vendor | Product | Versions | ||||||||
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| Arduino | Arduinocore-avr |
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Remediation
Tracking
Advisories
Metrics
Attack Vector Network
Attack Complexity Low
Privileges Required None
Attack Requirements None
User Interaction None
Vulnerable System Confidentiality Impact None
Vulnerable System Integrity Impact None
Vulnerable System Availability Impact Low
Subsequent System Confidentiality Impact None
Subsequent System Integrity Impact None
Subsequent System Availability Impact None
No CVSS v3.1
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.668% probability within 30 days)
Exploitation none
Automatable yes
Technical Impact partial
References
History
Sep 14, 2026 9:00 PM
Scoring metrics updated
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| Metrics |
ssvc
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Sep 13, 2026 8:30 PM
First appearance in the feed. Affected vendors updated
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| Type | Values Removed | Values Added |
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| First Time appeared |
Arduino
Arduino arduinocore-avr |
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| Vendors & Products |
Arduino
Arduino arduinocore-avr |
Sep 11, 2026 11:45 PM
Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| Description | ArduinoCore-avr contains the source code and configuration files of the Arduino AVR Boards platform. A vulnerability in versions prior to 1.8.8 allows an attacker to trigger a stack-based buffer overflow when concatenating floating-point values of sufficiently large magnitude onto an Arduino String object. By passing values near the extremes of the float or double range to `String::concat(float)`, `String::concat(double)`, `String::operator+=()`, or the `+` operator with a float/double operand, `dtostrf()` writes beyond the fixed-size stack buffer, causing memory corruption and denial of service. Under specific conditions, this could enable arbitrary code execution on AVR-based Arduino boards. The fix is included starting from the `1.8.8 `release. | |
| Title | ArduinoCore-AVR: Stack-Based Buffer Overflow in String float/double concatenation handler | |
| Weaknesses | CWE-120 | |
| References |
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| Metrics |
cvssV4_0
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Subscriptions
Weaknesses
