CVE-2026-8295 Medium Severity Vulnerability Details & Analysis

Summary

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

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

🎯 CISA SSVC Assessment Updated: May 14, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

NO

Requires human interaction

💥 Technical Impact

Partial

Limited system impact

🏆 Discovered By

Michał Majchrowicz (AFINE) Marcin Wyczechowski (AFINE)

SSVC data provided by CISA

CVE-2026-8295

Summary

Description

🎯 CISA SSVC Assessment Updated: May 14, 2026

📦 Affected Products 0

🔗 References 2