Vulnerability · Published Sep 24, 2026 · Assigned by mitre
CVE-2026-88358
Medium 6.5
In plain English
A medium-severity out-of-bounds read in the simdjson package (Debian). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities).
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | simdjson | no fix listed | DEBIAN-CVE-2026-88358 |
| Debian:14 | simdjson | no fix listed | DEBIAN-CVE-2026-88358 |
| Ubuntu:22.04:LTS | simdjson | no fix listed | UBUNTU-CVE-2026-88358 |
| Ubuntu:24.04:LTS | simdjson | no fix listed | UBUNTU-CVE-2026-88358 |
| Ubuntu:26.04:LTS | simdjson | no fix listed | UBUNTU-CVE-2026-88358 |
| Ubuntu:26.10 | simdjson | no fix listed | UBUNTU-CVE-2026-88358 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H