CVE-2026-78523
MediumCVSS 5.9Exploitation Probability (EPSS)
Elevated risk61th percentile - higher than 61% of all known CVEs
Summary
A use-after-free vulnerability in Windows DNS allows an unauthorized attacker to cause a denial of service over a network.
Risk Assessment
An attacker could crash the DNS service, disrupting network operations and availability of applications relying on name resolution.
Recommendation
Install Windows security updates and monitor DNS infrastructure for anomalies.
Other vulnerabilities in Windows DNS
See all- CVE-2026-69730Critical
Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.
- CVE-2026-62878Critical
A stack-based buffer overflow in Windows DNS allows an unauthorized attacker to execute code over a network.
- CVE-2026-72987High
Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.
- CVE-2026-72948Medium
Relative path traversal in Windows DNS allows an authorized attacker to elevate privileges locally.
- CVE-2026-72928High
Use-after-free in Windows DNS allows an authorized attacker to execute code over a network.
- CVE-2026-70091Medium
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows DNS allows an unauthorized attacker to deny service over a network.
- CVE-2026-69858High
A use-after-free vulnerability in Windows DNS allows an unauthorized attacker to execute code over a network.
- CVE-2026-69813High
Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.
- CVE-2026-69680High
Origin validation error in Windows DNS allows an unauthorized attacker to perform spoofing over a network.
- CVE-2026-69672Medium
Use of uninitialized resource in Windows DNS allows an authorized attacker to disclose information locally.
Original NVD description (English source)
Use after free in Windows DNS allows an unauthorized attacker to deny service over a network.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS