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PatchSiren cyber security CVE debrief

CVE-2023-43688 Malwarebytes CVE debrief

CVE-2023-43688 is a HIGH severity vulnerability in Malwarebytes 4.x and 5.x (and Nebula 2020-10-21 and later). An issue was discovered in Malwarebytes 4.x and 5.x (and Nebula 2020-10-21 and later). There is a Heap buffer overflow in various buffer encryption utilities. The CVSS score for this vulnerability is 7.5.

Vendor
Malwarebytes
Product
Malwarebytes 4.x and 5.x (including Nebula 2020‑10‑21 and later)
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-09
Advisory published
2026-06-09
Advisory updated
2026-06-09

Who should care

Users of Malwarebytes 4.x and 5.x (and Nebula 2020-10-21 and later) should be aware of this HIGH severity vulnerability and take action to mitigate it.

Technical summary

The vulnerability is caused by a Heap buffer overflow in various buffer encryption utilities in Malwarebytes 4.x and 5.x (and Nebula 2020-10-21 and later).

Defensive priority

HIGH

Recommended defensive actions

  • Apply patches or updates provided by the vendor to fix the vulnerability.
  • Use secure practices when using Malwarebytes 4.x and 5.x (and Nebula 2020-10-21 and later).

Evidence notes

The CVE was published on 2026-06-09T19:16:42.060Z and last modified on 2026-06-09T21:17:01.950Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2023-43688 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2023-43688

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2023-43688 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2023-43688

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.