Intel Hyperscan: Out-of-bounds write in user applications causes denial of service
Summary
Hyperscan versions before v5.4.2.1 contain an out-of-bounds write (CWE-787) that can be triggered by unprivileged local software running in Ring 3 user applications. A successful attacker can crash or disrupt the affected application, causing a denial of service. Exploitation requires local access and attack requirements that are present without special internal knowledge; no user interaction is needed. The CNA rates the severity as 5.9 (MEDIUM); NVD analysis is still pending.
Affected
- Intel Hyperscan before v5.4.2.1
- Products that embed a vulnerable Hyperscan version (vendor check required)
Fixed in
- Hyperscan v5.4.2.1 (likely fix; not explicitly confirmed for CVE-2026-33094 in the sources reviewed, verify in Intel advisory INTEL-SA-01511)
Workaround
- Unknown.
- Limit local access to trusted users until patched (third-party guidance, not from Intel).
Exploitation
- No known exploitation reported.
- No public proof of concept found at time of analysis.
- Not found in the CISA KEV catalog at time of analysis.
Our recommendation
- Identify hosts and products that embed or use Hyperscan, including multi-user Linux servers, shared hosts and CI/build runners.
- Update Hyperscan to v5.4.2.1 or later, or install the update from the vendor product that embeds it.
- Restrict local access to trusted users until patched.
- Recheck the Intel advisory and NVD for confirmed fixed versions and scoring changes.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Intel INTEL-SA-01511 Hyperscan Software Advisory intel.com
- Strix CVE-2026-33094 (CNA record summary) www.strix.ai
- OffSeq Radar CVE-2026-33094 radar.offseq.com
- Intel Security Center www.intel.com
- VulDB 433947 (sibling CVE, fixed in 5.4.2.1) vuldb.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 15:34.
Original description (NVD)
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.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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