---
id: "CVE-2026-40216"
page: "https://infrastack.ai/live/CVE-2026-40216"
kind: "vulnerability"
aliases: ["CVE-2026-40216"]
title: "Hyperscan: out-of-bounds read lets a local user crash applications"
severity: "medium"
cvss: 4.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["hyperscan", "intel", "local-users", "package"]
not_affected_if: ["hyperscan-v5.4.2.1-or-later", "no-local-untrusted-users"]
published_at: "2026-11-10T18:17:37+00:00"
first_seen_at: "2026-11-10T18:22:57+00:00"
updated_at: "2026-11-10T18:26:27+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40216", "first_seen_at": "2026-11-10T18:22:57+00:00"}]
exploit_sources: []
---

# Hyperscan: out-of-bounds read lets a local user crash applications

Link for people: https://infrastack.ai/live/CVE-2026-40216 (this .md is for agents)

Hyperscan, Intel's regular expression matching library, has an out-of-bounds read in versions before v5.4.2.1 when run in user space. A local user with an account can trigger it to cause a denial of service.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the Hyperscan version your applications link against, for example by looking at the package manifest or the installed library version.

## Fix

- Move to Hyperscan `v5.4.2.1` or later.

## Timeline

- 2026-11-10T18:22:57+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-40216

## From the sources

Out-of-bounds read for some Hyperscan before version v5.4.2.1 within Ring 3: User Applications may allow a denial of service. Unprivileged software adversary with an authenticated user combined with a low complexity attack may enable denial of service. This result may potentially occur via local access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (low), integrity (none) and availability (low) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_