---
id: "CVE-2026-33094"
page: "https://infrastack.ai/live/CVE-2026-33094"
kind: "vulnerability"
aliases: ["CVE-2026-33094"]
title: "Hyperscan: out-of-bounds write lets a local user crash applications"
severity: "medium"
cvss: 5.9
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["c", "hyperscan", "native-libs", "package"]
not_affected_if: ["hyperscan-not-used", "hyperscan-v5.4.2.1-or-later"]
published_at: "2026-11-10T18:17:36+00:00"
first_seen_at: "2026-11-10T18:22:57+00:00"
updated_at: "2026-11-10T18:24:58+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33094", "first_seen_at": "2026-11-10T18:22:57+00:00"}]
exploit_sources: []
---

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

Link for people: https://infrastack.ai/live/CVE-2026-33094 (this .md is for agents)

Hyperscan, Intel's regular-expression matching library, has an out-of-bounds write in some code paths that runs in user-mode applications. A local unprivileged user 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

- Find where Hyperscan is used: look for `libhs` or `hyperscan` in build files and dependency manifests.
- Check the installed Hyperscan version against the fixed version.

## Fix

- Hyperscan: move to `v5.4.2.1` or later.

## Timeline

- 2026-11-10T18:22:57+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-33094

## From the sources

Out-of-bounds write 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 unauthenticated user combined with a low complexity attack may enable denial of service. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (low) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.

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