CVE-2026-88358 Memory corruption in n/a
A crafted JSON document triggers an out-of-bounds read in simdjson, causing application termination and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-88358?
CVE-2026-88358 is a medium-severity memory corruption vulnerability in n/a, published on 24 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
simdjson 4.6.1 contains a one-byte out-of-bounds read vulnerability in dom::parser::parse_unpadded(). A specially crafted truncated JSON document whose final structural token closes a nested array or object can cause json_iterator::walk_document() to access buf[len] after the input buffer has been exhausted. This results in a heap out-of-bounds read and may cause application termination, leading to denial of service.
Weakness: CWE-125
Which versions are affected by CVE-2026-88358?
How do I fix CVE-2026-88358?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-88358 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-88358 exists.
Sources
Also known as BELL-CVE-2026-88358, DEBIAN-CVE-2026-88358, GHSA-w8jv-57mm-8396, UBUNTU-CVE-2026-88358.