Report an incident
Back
  • About us
  • For experts
Report an incident
About us
About our team Contact
Baza wiedzy
Fałszywe inwestycje Uważaj na fałszywe sklepy online (Nie)bezpieczne płatności Fałszywi konsultanci Zadbaj o bezpieczne hasła i logowanie Fałszywe załączniki w mailach Fałszywe prośby o szybki przelew Bezpieczny telefon
Biuletyn OUCH!
Porady bezpieczeństwa OUCH!
Tools
n6 Artemis MWDB
CVD program
CVD policy Advisories

Vulnerability in simdjson library
14 May 2026 | CERT Polska | #vulnerability, #warning, #cve
CVE ID CVE-2026-8295
Publication date 14 May 2026
Vendor simdjson
Product simdjson
Vulnerable versions All before 4.6.4
Vulnerability type (CWE) Integer Overflow or Wraparound (CWE-190)
Report source Report to CERT Polska

Description

CERT Polska has received a report about vulnerability in simdjson library and participated in coordination of its disclosure.

The vulnerability CVE-2026-8295: 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 release 4.6.4.

Credits

We thank Michał Majchrowicz and Marcin Wyczechowski from AFINE for the responsible vulnerability report.

More about the coordinated vulnerability disclosure process at CERT Polska can be found at https://cert.pl/en/cvd/.