CVE-2026-8295

Medium

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

SeverityMedium

CVSS6.9

Exploit probability—

ProductSimdjson

PublishedMay 14, 2026

First seenMay 14, 2026

Weakness typeCWE-190Integer overflow

How to fix

Update

simdjson simdjson4.6.4 or later

Vendor advisories

github.com/simdjson/simdjson/releases/tag/v4.6.4

Affected products

Product	Affected versions	Fixed in
simdjson simdjson	v < 4.6.4	4.6.4

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