Threat Intelligence / CVE / CVE-2026-42831

CVE-2026-42831

CVSS 7.8 (HIGH) · EPSS 0.1% · Priority 4.7/10 · Published 2026-05-12

As of 2026-05-26, CVE-2026-42831 is a CVSS 7.8 (HIGH-severity) vulnerability. EPSS exploitation probability 0.1%. Threadlinqs Intelligence tracks 1 threat exploiting it.

Last updated: 2026-05-26

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

CVSS v3 vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Weaknesses (CWE)

CWE-122

Threats tracking this CVE

Microsoft May 2026 Patch Tuesday — 137 CVEs, 31 Critical (16 RCE) Including CVE-2026-41089 Pre-Auth Netlogon Stack Overflow on Domain Controllers — HIGH

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42831

Full detection coverage & IOCs for threats exploiting CVE-2026-42831 are available via the Threadlinqs MCP server (Purple tier). View plans →

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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.