Quick answers
- Is CVE-2026-118729 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-118729 being exploited in the wild.
- How severe is CVE-2026-118729?
- High severity, with a CVSS score of 8.8, published 10 November 2026.
- Which products and versions are affected?
- Microsoft Office Excel.
- Is there a fix for CVE-2026-118729?
- 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-2026-118729 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-118729?
- Check whether you run Microsoft Office Excel. 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 use-after-free flaw exists in Excel's memory management, allowing an attacker to execute code by crafting a malicious spreadsheet. The vulnerability requires the victim to open the file but does not require authentication or local access. Successful exploitation results in arbitrary code execution with the privileges of the user running Excel.
Affected products
- Microsoft Office Excel
Timeline
- 2026-11-10: disclosed