CVE-2026-42831 json
Microsoft Office Remote Code Execution Vulnerability
published 2026-05-12 5 mo ago modified 2026-10-26 14 d ago also EUVD-2026-29711
- cvss
- 7.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 38%
- public exploits
- 0
- none known
Summary
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Patch / fix
- Microsoft Microsoft Office for Android 16.0.19822.20190
- Microsoft Microsoft Office LTSC for Mac 2021 16.109.26051019
- Microsoft Microsoft Office LTSC for Mac 2024 16.109.26051019
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5 mo ago
Exploit prediction
0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.8 | 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 |
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected products
- Microsoft Microsoft Office for Android
- Microsoft Microsoft Office LTSC for Mac 2021
- Microsoft Microsoft Office LTSC for Mac 2024
Classification
- Weakness
-
- CWE-122 Heap-based Buffer Overflow
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-42831
vendor-advisory, patch
Sources
- CVE List CVE-2026-42831
- NVD CVE-2026-42831
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