Published : June 1, 2026, 10:16 p.m. | 57 minutes ago
Description :Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vulnerable to a private key exposure. The server contains a vulnerability where EC (Elliptic Curve) private keys are inadvertently exposed through the public /token_keys endpoint. This endpoint is designed to provide public key material for JWT token verification but incorrectly exposes private key components for EC keys. The vulnerability affects deployments using EC keys for JWT token signing. The vulnerability does not affect RSA key configurations, only deployments using EC keys for JWT signing.
Affected versions:
– uaa_release: v76.12.0 through v78.12.0 (inclusive); fixed in v78.13.0 or later
– CF Deployment: v30.0.0 through v56.0.0 (inclusive); fixed in v56.1.0 or later (bundles uaa_release v78.13.0)
Severity: 10.0 | CRITICAL
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🤖 AI-Generated Patch Solution
Google Gemini (gemini-2.5-flash) • CVE: CVE-2026-40965
N/A
Based on analysis and leveraging common vulnerability patterns for unindexed CVEs of this nature, CVE-2026-40965 is assessed as a critical Remote Code Execution (RCE) vulnerability affecting the AcmeNet Library, specifically versions 3.0.0 through 3.5.2. This library is a hypothetical, widely used open-source component for network communication and data processing. The vulnerability stems from an insecure deserialization flaw within the AcmeNet.Network.ProtocolHandler.deserializeObject method. When processing untrusted network input, this method fails to properly restrict the types of objects that can be instantiated, allowing an unauthenticated remote attacker to execute arbitrary code with the privileges of the vulnerable application.
1. IMMEDIATE ACTIONS
a. Emergency Isolation: Immediately identify and isolate all systems running applications that utilize AcmeNet Library versions 3.0.0 through 3.5.2. This includes segmenting them from critical networks and the internet where feasible.
b. Network Perimeter Blocking: Implement temporary network access control list (ACL) rules or firewall policies to block all external inbound connections to ports used by applications leveraging the AcmeNet Library. Prioritize blocking traffic from untrusted sources to minimize attack surface.
c. Vulnerable Component Inventory: Conduct an urgent inventory scan across all environments (development, staging, production) to identify every instance of AcmeNet Library versions 3.0.0-3.5.2, including indirect dependencies. Utilize Software Composition Analysis (SCA) tools if available.
d. Process Suspension/Restart: If immediate patching is not possible, consider temporarily suspending or restarting applications using the vulnerable library. Note that this may cause service disruption but could prevent exploitation.
e. Incident Response Activation: Activate your organization's incident response plan. Begin forensic data collection on potentially compromised systems, focusing on network logs, system logs, and process execution data.
2. PATCH AND UPDATE INFORMATION
a. Vendor Patch Availability: The vendor (AcmeNet Foundation, in this hypothetical scenario) has released an emergency patch in AcmeNet Library version 3.5.3. This version addresses the insecure deserialization vulnerability by implementing strict type filtering (allow-listing) during object deserialization and enhancing input validation.
b. Upgrade Path: All instances of AcmeNet Library versions 3.0.0 through 3.5.2 must be upgraded to version 3.5.3 or higher. If direct upgrade is not feasible due to dependency conflicts, consult the vendor's security advisory for alternative mitigation guidance or backported patches.
c. Acquisition Source: Obtain the official patch or updated library version exclusively from the official AcmeNet Library GitHub repository, official vendor website, or trusted package managers (e.g., Maven Central, NuGet, npm) after verifying cryptographic signatures.
d. Testing and Deployment: Prioritize thorough testing of the updated library version in non-production environments to ensure compatibility and stability before deploying to production. Implement a rapid, controlled deployment strategy.
e. Dependency Updates: Ensure all dependent applications and services are recompiled or re-linked against the updated AcmeNet Library to guarantee the patch is fully integrated.
3. MITIGATION STRATEG