# CVE-2026-63540: Intel Hyperscan heap-based buffer overflow denial of service

Source: https://junglewise.ai/threats/cve-2026-63540-heap-based-buffer-overflow-for-some-hyperscan-before-version-v5-4  
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-2026-63540 · Severity: info · Published 2026-11-10

Intel Hyperscan is a pattern matching library used in applications to process data. A heap-based buffer overflow in versions before 5.4.2.1 can be exploited by an unprivileged user on the same system to cause the application to crash, resulting in a denial of service.

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

## Quick answers

**Is CVE-2026-63540 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-63540 being exploited in the wild.

**How severe is CVE-2026-63540?** 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-2026-63540?** Yes: fixed in v5.4.2.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-63540 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-63540?** 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 v5.4.2.1

## Technical details

A heap-based buffer overflow vulnerability exists in Intel Hyperscan before version 5.4.2.1 affecting user-mode applications (Ring 3). An unauthenticated unprivileged attacker with local access and passive user interaction can trigger the overflow, causing denial of service with low integrity impact and high availability impact.

## 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 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 out-of-bounds read in user applications](https://junglewise.ai/threats/cve-2026-40424-out-of-bounds-read-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)