CVE catalog

CVE-2026-40358

Heap-based buffer overflow in Microsoft Office allows…

[CVE catalog]

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

Severity
High · CVSS 8.4CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
Source
[NVD] · [CVE record]
EPSS
0.37% · Oct 27, 2026

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence
Original provider fields
{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "365_apps",
      "ecosystem": "cpe",
      "fixed_version": ""
    },
    {
      "name": "office",
      "ecosystem": "cpe",
      "fixed_version": ""
    },
    {
      "name": "office_long_term_servicing_channel",
      "ecosystem": "cpe",
      "fixed_version": ""
    },
    {
      "name": "365_apps",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-40358"
    },
    {
      "name": "office",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-40358"
    },
    {
      "name": "office_long_term_servicing_channel",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-40358"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

Observed:

References

[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)]