How severe is CVE-2026-97749?

CVE-2026-97749 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-97749 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-97749?

CVE-2026-97749 primarily affects Microsoft 365 Apps. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-97749?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2026-97749 published?

CVE-2026-97749 was published on 2026-10-13 and last updated on 2026-10-15.

CVE-2026-97749

CVE-2026-97749 is a critical-severity vulnerability in Microsoft 365 Apps with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-415.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-415
Affected product: Microsoft 365 Apps
Published: 2026-10-13
Last modified: 2026-10-15

Description

Double free in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

Frequently asked questions

What is CVE-2026-97749?: Double free in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
How severe is CVE-2026-97749?: CVE-2026-97749 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-97749 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-97749?: CVE-2026-97749 primarily affects Microsoft 365 Apps. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-97749?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2026-97749 published?: CVE-2026-97749 was published on 2026-10-13 and last updated on 2026-10-15.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97749

Affected products (5)

cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*

More vulnerabilities in Microsoft 365 Apps

CVE-2026-97016 — Critical (CVSS 9.8): Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
CVE-2026-88178 — Critical (CVSS 9.8): Use after free in Microsoft Office PowerPoint allows an unauthorized attacker to execute code over a network.
CVE-2026-88156 — Critical (CVSS 9.8): Stack-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
CVE-2026-70300 — Critical (CVSS 9.8): Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
CVE-2026-70291 — Critical (CVSS 9.8): Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
CVE-2026-70242 — Critical (CVSS 9.8): Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

All CVEs affecting Microsoft 365 Apps →

Other CWE-415 (Double Free) vulnerabilities

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CVE-2026-96864 — Critical (CVSS 9.8): Double free in Microsoft Failover Cluster Virtual Driver allows an unauthorized attacker to execute code over a network.
CVE-2026-5759 — Critical (CVSS 9.8): A double free and use-after-free vulnerability in the RdbLoadDeletedNodes function of the RDB graph decoders…
CVE-2026-84561 — Critical (CVSS 9.8): A double free issue was addressed with improved memory management. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS…
CVE-2026-77493 — Critical (CVSS 9.8): Double free in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.

Browse all CWE-415 (Double Free) vulnerabilities →