CVE-2026-8295
Integer overflow in simdjson
Vexday Risk Score
13Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 6.9EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
14 May 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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
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
Affected products
simdjson · simdjsonWant to know if your infrastructure is exposed to this?
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