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CVE-2026-48490— ArduinoCore-AVR: Stack-Based Buffer Overflow in String float/double concatenation handler

Quick assessment

Affected
arduino ArduinoCore-avr
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ArduinoCore-avr 包含 Arduino AVR 板级平台的源代码和配置文件。在 1.8.8 之前的版本中存在一个漏洞：攻击者可以通过将一个数值足够大的浮点值追加到 Arduino 的 String 对象中，从而触发基于栈的缓冲区溢出。具体而言，当向 、 、 或带有 float/double 操作数的 运算符传入接近 float 或 double 类型取值范围极限的值时， 函数会在固定大小的栈缓冲区之外写入数据，导致内存损坏并引发拒绝服务（DoS）。在特定条件下，此漏洞还可能导致在基于 AVR 的 Ar

CVSS 6.9 · Medium EPSS 0.39% · P33

Affected Version Matrix 1

VendorProduct Version RangeStatus
arduino ArduinoCore-avr < 1.8.8 affected
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I. Basic Information for CVE-2026-48490

Vulnerability Information
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Vulnerability Title
ArduinoCore-AVR: Stack-Based Buffer Overflow in String float/double concatenation handler
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
arduino ArduinoCore-avr < 1.8.8 -

II. Public POCs for CVE-2026-48490

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III. Intelligence Information for CVE-2026-48490

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Patches & Fixes for CVE-2026-48490 (1)

Vendor Advisories for CVE-2026-48490 (1)

Vendor Pages for CVE-2026-48490 (1)

IV. Related Vulnerabilities

Same product: ArduinoCore-avr
Same vendor: arduino
Same weakness: CWE-120

V. Comments for CVE-2026-48490

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