CVE-2026-8295
Integer overflow in simdjson
- State
- Published
- Severity
- 6.9 Medium
- Published
- May 14, 2026
- Updated
- May 14, 2026
- Reserved
- May 11, 2026
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
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | 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 | CERT-PL |
Weaknesses
- CWE-190 Integer Overflow or Wraparound
Affected Products
| Product | Versions |
|---|---|
simdjsonsimdjson |
|
References
- https://github.com/simdjson/simdjson/releases/tag/v4.6.4release-notes
- https://cert.pl/posts/2026/05/CVE-2026-8295third-party-advisory
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