---
id: "CVE-2026-28730"
page: "https://infrastack.ai/live/CVE-2026-28730"
kind: "vulnerability"
aliases: ["CVE-2026-28730"]
title: "Hyperscan: null pointer dereference lets a local user crash applications"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "Hyperscan", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["c", "hyperscan", "local-users", "package"]
not_affected_if: ["hyperscan-not-used", "no-local-untrusted-users"]
published_at: "2026-11-10T18:17:36+00:00"
first_seen_at: "2026-11-10T18:22:57+00:00"
updated_at: "2026-11-10T18:24:37+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28730", "first_seen_at": "2026-11-10T18:22:57+00:00"}]
exploit_sources: []
---

# Hyperscan: null pointer dereference lets a local user crash applications

Link for people: https://infrastack.ai/live/CVE-2026-28730 (this .md is for agents)

Hyperscan, Intel's regular expression matching library, has a null pointer dereference in versions before v5.4.2.1 that an unprivileged local user can trigger. An attacker can crash the application using it, causing denial of service, but cannot read or change data.

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

## Affected

- vendor:Hyperscan affected range not listed fixed no fixed version listed

## How to check

- Check the installed Hyperscan version, for example with `pkg-config --modversion libhs` or in the build files of your project
- Look for applications that link Hyperscan and run on systems where untrusted local users have accounts

## Fix

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

## Timeline

- 2026-11-10T18:22:57+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-28730

## From the sources

Null pointer dereference 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 not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (none) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.

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