# CVE-2026-40424: Intel Hyperscan out-of-bounds read in user applications

Source: https://junglewise.ai/threats/cve-2026-40424-out-of-bounds-read-for-some-hyperscan-before-version-v5-4-2-1  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-40424 · Severity: info · Published 2026-11-10

Hyperscan is a regex pattern-matching library used in applications for scanning data. An out-of-bounds memory read vulnerability could allow an unprivileged attacker on the same system to crash applications using the library, causing a denial of service. The attack requires local access and no special privileges or user interaction.

Technologies: [Intel Hyperscan](https://junglewise.ai/threats/technologies/hyperscan). Vendors: [Intel](https://junglewise.ai/threats/vendors/intel).

## Quick answers

**Is CVE-2026-40424 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-40424 being exploited in the wild.

**How severe is CVE-2026-40424?** Informational severity, published 10 November 2026.

**Which products and versions are affected?** Intel Hyperscan before v5.4.2.1.

**Is there a fix for CVE-2026-40424?** Yes: fixed in Hyperscan v5.4.2.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-40424 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-40424?** Check whether you run Intel Hyperscan at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in Hyperscan v5.4.2.1

## Technical details

An out-of-bounds read in Hyperscan before v5.4.2.1 can be triggered via a crafted input processed by Ring 3 user-mode applications. The vulnerability is reachable locally by an unauthenticated, unprivileged attacker with low attack complexity and no user interaction required. This results in denial of service through application crash or hang, with potential low-impact information disclosure.

## Affected products

- Intel Hyperscan before v5.4.2.1

## Timeline

- 2026-11-10: disclosed

## References

- [https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01511.html](https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01511.html)

## Related threats

- [Intel Hyperscan heap-based buffer overflow denial of service](https://junglewise.ai/threats/cve-2026-63540-heap-based-buffer-overflow-for-some-hyperscan-before-version-v5-4)
- [Intel Hyperscan out-of-bounds write denial of service](https://junglewise.ai/threats/cve-2026-40694-out-of-bounds-write-for-some-hyperscan-before-version-v5-4-2-1)
- [Intel Hyperscan multiple memory safety vulnerabilities](https://junglewise.ai/threats/cve-2026-40216-out-of-bounds-read-for-some-hyperscan-before-version-v5-4-2-1)
- [Intel Hyperscan untrusted pointer dereference DoS](https://junglewise.ai/threats/cve-2026-34489-untrusted-pointer-dereference-for-some-hyperscan-before-version)
- [Intel Hyperscan heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-34017-heap-based-buffer-overflow-for-some-hyperscan-before-version-v5-4)