# CVE-2026-119995: Microsoft Office Outlook heap buffer overflow

Source: https://junglewise.ai/threats/cve-2026-119995-heap-based-buffer-overflow-in-microsoft-office-outlook-allows-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-119995 · Severity: high · CVSS 7.5 · Published 2026-11-10

Microsoft Office Outlook, an email and calendar client used across enterprises, contains a heap-based buffer overflow vulnerability that allows an attacker to execute arbitrary code over the network. An attacker can exploit this flaw without authentication to gain remote code execution, potentially compromising email data, installing malware, or lateral movement within corporate networks.

Technologies: [Microsoft Office Outlook](https://junglewise.ai/threats/technologies/office-outlook). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-119995 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-119995 being exploited in the wild.

**How severe is CVE-2026-119995?** High severity, with a CVSS score of 7.5, published 10 November 2026.

**Which products and versions are affected?** Microsoft Office Outlook.

**Is there a fix for CVE-2026-119995?** 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.

**How is CVE-2026-119995 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-119995?** Check whether you run Microsoft Office Outlook. 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.

## Technical details

A heap-based buffer overflow exists in Outlook's parsing logic, allowing network-based code execution. The vulnerability is reachable over the network without prior authentication, and exploitation results in arbitrary code execution with Outlook's privileges.

## Affected products

- Microsoft Office Outlook

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-119995](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-119995)

## Related threats

- [Microsoft Office Outlook path traversal in pathname handling](https://junglewise.ai/threats/cve-2026-124228-improper-limitation-of-a-pathname-to-a-restricted-directory-path)
- [Microsoft Office Outlook use of uninitialized resource code execution](https://junglewise.ai/threats/cve-2026-124227-use-of-uninitialized-resource-in-microsoft-office-outlook-allows)
- [Microsoft Office Outlook user warning spoofing vulnerability](https://junglewise.ai/threats/cve-2026-124194-microsoft-office-outlook-missing-user-interaction-for)
- [Microsoft Office Outlook heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-123383-heap-based-buffer-overflow-in-microsoft-office-outlook-allows-an)
- [Microsoft Office Outlook untrusted pointer dereference](https://junglewise.ai/threats/cve-2026-123382-untrusted-pointer-dereference-in-microsoft-office-outlook-allows)