一、 漏洞 CVE-2025-62493 基础信息
漏洞信息
                                        # QuickJS js_bigint_to_string1 堆越界读取漏洞

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漏洞标题
Heap out-of-bounds read in js_bigint_to_string1 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 conversion logic (js_bigint_to_string1) due to an incorrect calculation of the required number of digits, which in turn leads to reading memory past the allocated BigInt structure. * The function determines the number of characters (n_digits) needed for the string representation by calculating: $$ \\ \text{n\_digits} = (\text{n\_bits} + \text{log2\_radix} - 1) / \text{log2\_radix}$$ $$$$This formula is off-by-one in certain edge cases when calculating the necessary memory limbs. For instance, a 127-bit BigInt using radix 32 (where $\text{log2\_radix}=5$) is calculated to need $\text{n\_digits}=26$. * The maximum number of bits actually stored is $\text{n\_bits}=127$, which requires only two 64-bit limbs ($\text{JS\_LIMB\_BITS}=64$). * The conversion loop iterates $\text{n\_digits}=26$ times, attempting to read 5 bits in each iteration, totaling $26 \times 5 = 130$ bits. * In the final iterations of the loop, the code attempts to read data that spans two limbs: C c = (r->tab[pos] >> shift) | (r->tab[pos + 1] << (JS_LIMB_BITS - shift)); * Since the BigInt was only allocated two limbs, the read operation for r->tab[pos + 1] becomes an Out-of-Bounds Read when pos points to the last valid limb (e.g., $pos=1$). This vulnerability allows an attacker to cause the engine to read and process data from the memory immediately following the BigInt buffer. This can lead to Information Disclosure of sensitive data stored on the heap adjacent to the BigInt object.
来源：美国国家漏洞数据库 NVD
CVSS信息
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来源：美国国家漏洞数据库 NVD
漏洞类别
跨界内存读
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字符串转换逻辑中位数计算错误，可能导致越界读取和信息泄露。
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-2025-62493 的公开POC
# POC 描述 源链接 神龙链接
三、漏洞 CVE-2025-62493 的情报信息
四、漏洞 CVE-2025-62493 的评论

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