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CVE-2026-8295— Integer overflow in simdjson

Quick assessment

Affected
simdjson simdjson
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.

simdjson是simdjson开源的一个高性能JSON解析库。 simdjson 4.6.4之前版本存在输入验证错误漏洞，该漏洞源于string_builder::escape_and_append函数在处理大型输入字符串时存在整数溢出，可能导致缓冲区分配不足，进而导致SIMD例程中越界内存读取，可能导致信息泄露、内存损坏或格式错误的JSON输出。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
simdjson simdjson < 4.6.4 affected
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I. Basic Information for CVE-2026-8295

Vulnerability Information
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Vulnerability Title
Integer overflow in simdjson
Source: CVE Program / CVE List V5
Vulnerability Description
An integer overflow vulnerability in the simdjson document-builder API allows incorrect buffer size calculations in "string_builder::escape_and_append()" when processing very large input strings on platforms with limited "size_t" width (e.g., 32-bit builds). The overflow can cause insufficient buffer allocation, leading to out-of-bounds memory reads in SIMD routines and potentially resulting in information disclosure, memory corruption, or malformed JSON output. This vulnerability has been fixed in 4.6.4 release
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
simdjson 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
simdjson是simdjson开源的一个高性能JSON解析库。 simdjson 4.6.4之前版本存在输入验证错误漏洞，该漏洞源于string_builder::escape_and_append函数在处理大型输入字符串时存在整数溢出，可能导致缓冲区分配不足，进而导致SIMD例程中越界内存读取，可能导致信息泄露、内存损坏或格式错误的JSON输出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
simdjson simdjson 0 ~ 4.6.4 -

II. Public POCs for CVE-2026-8295

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III. Intelligence Information for CVE-2026-8295

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Security Blog Posts for CVE-2026-8295 (1)

Vendor Pages for CVE-2026-8295 (1)

IV. Related Vulnerabilities

Same weakness: CWE-190

V. Comments for CVE-2026-8295

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