# CVE-2026-70310: Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Source: https://junglewise.ai/threats/cve-2026-70310-out-of-bounds-read-in-microsoft-office-word-allows-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-11  
License: CC BY 4.0 with a link back

CVE-2026-70310 · Severity: medium · CVSS 5.5 · Published 2026-08-11

Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Technologies: [Microsoft 365 Apps](https://junglewise.ai/threats/technologies/365-apps), [Microsoft 365](https://junglewise.ai/threats/technologies/microsoft-365), [Microsoft Office 2019](https://junglewise.ai/threats/technologies/office-2019), [Microsoft Office 2021](https://junglewise.ai/threats/technologies/office-2021), [Microsoft Office 2024](https://junglewise.ai/threats/technologies/office-2024), [Microsoft Word](https://junglewise.ai/threats/technologies/word). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-70310 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-70310 being exploited in the wild.

**How severe is CVE-2026-70310?** Medium severity, with a CVSS score of 5.5, published 11 August 2026.

**Which products and versions are affected?** Microsoft 365 Apps, Microsoft 365, Microsoft Office 2019, Microsoft Office 2021 and 2 more. The advisory does not name versions.

**Is there a fix for CVE-2026-70310?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-70310?** Check whether you run Microsoft 365 Apps, Microsoft 365, Microsoft Office 2019 or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Microsoft 365 Apps
- Microsoft 365
- Microsoft Office 2019
- Microsoft Office 2021
- Microsoft Office 2024
- Microsoft Word

## Related threats

- [Microsoft Word use-after-free remote code execution](https://junglewise.ai/threats/cve-2026-112735-use-after-free-in-microsoft-office-word-allows-an-unauthorized)
- [Microsoft Word heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-112724-heap-based-buffer-overflow-in-microsoft-office-word-allows-an)
- [Microsoft Word heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-112716-heap-based-buffer-overflow-in-microsoft-office-word-allows-an)
- [Microsoft Word heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-111306-heap-based-buffer-overflow-in-microsoft-office-word-allows-an)
- [Microsoft Office Word heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-110056-heap-based-buffer-overflow-in-microsoft-office-word-allows-an)