一、 漏洞 CVE-2025-62496 基础信息
漏洞信息
                                        # QuickJS `js_bigint_from_string` 整数溢出漏洞

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漏洞标题
Integer overflow in js_bigint_from_string in QuickJS
来源:美国国家漏洞数据库 NVD
漏洞描述信息
A vulnerability exists in the QuickJS engine's BigInt string parsing logic (js_bigint_from_string) when attempting to create a BigInt from a string with an excessively large number of digits. The function calculates the necessary number of bits (n_bits) required to store the BigInt using the formula: $$\text{n\_bits} = (\text{n\_digits} \times 27 + 7) / 8 \quad (\text{for radix 10})$$ * For large input strings (e.g., $79,536,432$ digits or more for base 10), the intermediate calculation $(\text{n\_digits} \times 27 + 7)$ exceeds the maximum value of a standard signed 32-bit integer, resulting in an Integer Overflow. * The resulting n_bits value becomes unexpectedly small or even negative due to this wrap-around. * This flawed n_bits is then used to compute n_limbs, the number of memory "limbs" needed for the BigInt object. Since n_bits is too small, the calculated n_limbs is also significantly underestimated. * The function proceeds to allocate a JSBigInt object using this underestimated n_limbs. * When the function later attempts to write the actual BigInt data into the allocated object, the small buffer size is quickly exceeded, leading to a Heap Out-of-Bounds Write as data is written past the end of the allocated r->tab array.
来源:美国国家漏洞数据库 NVD
CVSS信息
N/A
来源:美国国家漏洞数据库 NVD
漏洞类别
整数溢出或超界折返
来源:美国国家漏洞数据库 NVD
漏洞标题
QuickJS 安全漏洞
来源:中国国家信息安全漏洞库 CNNVD
漏洞描述信息
QuickJS是QuickJS开源的一个小型且可嵌入的 Javascript 引擎。 QuickJS存在安全漏洞,该漏洞源于BigInt字符串解析逻辑中存在整数溢出,可能导致堆越界写入。
来源:中国国家信息安全漏洞库 CNNVD
CVSS信息
N/A
来源:中国国家信息安全漏洞库 CNNVD
漏洞类别
其他
来源:中国国家信息安全漏洞库 CNNVD
二、漏洞 CVE-2025-62496 的公开POC
# POC 描述 源链接 神龙链接
三、漏洞 CVE-2025-62496 的情报信息
四、漏洞 CVE-2025-62496 的评论

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