CVE-2026-8295 Integer overflow in simdjson
An integer overflow in simdjson's document-builder API on 32-bit platforms can lead to out-of-bounds reads, potentially causing information disclosure or memory corruption.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8295?
CVE-2026-8295 is a medium-severity vulnerability in simdjson, published on 14 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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
Weakness: CWE-190
Which versions are affected by CVE-2026-8295?
How do I fix CVE-2026-8295?
No fix has been published for CVE-2026-8295 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-8295 being exploited?
There is no known exploitation of CVE-2026-8295 in the wild and no public exploit code.
Sources
Also known as GHSA-fh2w-3fv3-7vw2.