CVE-2026-48490

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Source

https://cve.org/CVERecord?id=CVE-2026-48490

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48490.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-48490

Aliases

GHSA-fhp2-f8hw-mgpj

Published

2026-09-11T21:00:06Z

Modified

2026-10-21T02:58:19Z

Severity

6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator

Summary

ArduinoCore-AVR: Stack-Based Buffer Overflow in String float/double concatenation handler

Details

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.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-120"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48490.json"
}

References

Affected packages

Git / github.com/arduino/arduinocore-avr

Affected ranges

Type

GIT

Repo

https://github.com/arduino/arduinocore-avr

Events

Introduced

Fixed

86df345b3cf46754a5db38fb983ec2808ce31303

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.8.8"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "original_tag":  "1.8.8",
            "range":  [
                {
                    "fixed":  "86df345b3cf46754a5db38fb983ec2808ce31303"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.8.8"
                }
            ],
            "source":  "DESCRIPTION"
        }
    ]
}

Affected versions

1.*

1.6.22

1.6.23

1.8.1

1.8.2

1.8.3

1.8.4

1.8.5

1.8.6

1.8.7

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48490.json"