Critical Alert 1 Active Exploit Detected Today

CVE-2026-63077 — JetBrains TeamCity Deserialization of Untrusted Data Vulnerability →
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August 6, 2026

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CVE-2026-39868NVD

Vulnerability Summary

This issue was addressed with improved input validation. This issue is fixed in iOS 26.5.2 and iPadOS 26.5.2, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, watchOS 26.6. An app may be able to cause unexpected system termination or corrupt kernel memory.
Severity Level
CRITICAL(9.1)
Published Date
Jun 29, 2026
Last Modified
Jul 27, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.94%Probability
Root Weakness (CWE)
CWE-20: Improper Input Validation ↗
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required.
CVSS v3.1 Base Metrics
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh

External References