What is CVE-2026-70329?
Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
The record classifies CVE-2026-70329 under weakness class CWE-190. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 5 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 55 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 4.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-08-11, last modified 2026-08-12
Is CVE-2026-70329 being exploited?
No public exploitation evidence for CVE-2026-70329 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-08-12. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.
Affected products and versions
- Microsoft: 365 Apps for Enterprise, Office 2019, Office LTSC 2021, Office LTSC 2024, Outlook 2016
How to fix CVE-2026-70329
No vendor patch reference has been recorded for CVE-2026-70329 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-70329
1 tracked threat in the Threadlinqs corpus references CVE-2026-70329, either in the campaign’s CVE list or as an indicator on the campaign record.
- CVE-2026-70329: Microsoft Outlook Remote Code Execution via Integer Overflow — HIGH · 2026-08-11
Sources
Enriched from CVE.org, NVD, GitHub Security Advisories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.