---
id: "CVE-2026-34017"
page: "https://infrastack.ai/live/CVE-2026-34017"
kind: "vulnerability"
aliases: ["CVE-2026-34017"]
title: "Hyperscan: heap buffer overflow lets a local user crash the process"
severity: "medium"
cvss: 5.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["c++", "hyperscan", "package"]
not_affected_if: ["hyperscan-not-used", "hyperscan-v5.4.2.1-or-later"]
published_at: "2026-11-10T18:17:37+00:00"
first_seen_at: "2026-11-10T18:22:57+00:00"
updated_at: "2026-11-10T18:25:05+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34017", "first_seen_at": "2026-11-10T18:22:57+00:00"}]
exploit_sources: []
---

# Hyperscan: heap buffer overflow lets a local user crash the process

Link for people: https://infrastack.ai/live/CVE-2026-34017 (this .md is for agents)

Hyperscan, Intel's regular expression matching library, has a heap-based buffer overflow in versions before v5.4.2.1. 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

- Check the installed Hyperscan version, for example with `pkg-config --modversion libhs` or the version in your build files.
- Look for Hyperscan in your dependency lists and container images.

## 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-2026-34017

## From the sources

Heap-based buffer overflow 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 passive 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.

---

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