Security news, decoded.

Security researchers report a resurgence and expansion of the JDY botnet, a covert network attributed to China-nexus state-sponsored threat activity. JDY now targets more than 1,500 SOHO and IoT devices and operates as a centralized scanner to discover, fingerprint, and continuously map exposed services for later exploitation. The activity includes use of edge-device vulnerabilities such as CVE-2026-35616, highlighting ongoing risk to internet-facing infrastructure and the persistence of reconnaissance capabilities even after related takedowns.

Security researchers report that an unpatched vulnerability in Langflow, an open-source low-code AI application platform, is being exploited in the wild. CVE-2026-5027 (CVSS 8.8) is a path traversal issue that can allow arbitrary file writes via the POST /api/v2/files endpoint, and unauthenticated access can be sufficient to reach the vulnerable code path before exploitation. This matters because it enables remote compromise without valid credentials, adding to a series of active Langflow attacks this year tied to CVE-2026-0770, CVE-2026-33017, CVE-2026-21445, and CVE-2025-34291.

CISA added three vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog after reports of in-the-wild exploitation, affecting Cisco Catalyst SD-WAN Manager, Google Chrome V8, and Arista Extensible Operating System (EOS). The listed issues are CVE-2026-20245 (Cisco; authenticated local command execution as root), CVE-2026-11645 (Chrome V8; sandbox escape via crafted HTML for remote code execution), and CVE-2026-7473 (Arista EOS; improper handling of tunnel traffic that can process unexpected tunneled packets). It matters because the KEV listing signals active attacker use, and federal civilian agencies have been directed to remediate or mitigate by June 23, 2026.

Microsoft released security updates for a zero-day in Microsoft Exchange Server that has been exploited in real-world attacks, enabling attackers to run arbitrary JavaScript via a cross-site scripting (XSS) path that targets Outlook Web Access users. The issue, tracked as CVE-2026-42897, affects Exchange Server 2016, Exchange Server 2019, and Exchange Server Subscription Edition (SE), and can be triggered remotely by sending a crafted email without special privileges. This matters because the flaw allows malicious script execution in the victim’s browser context, increasing the risk of account and session compromise; defenders should apply the June 2026 fixes and keep the related mitigations enabled.

Researchers disclosed six security issues in protobuf.js (often used with Google Cloud client libraries, Baileys, and CI/CD workflows), collectively dubbed Proto6. The vulnerabilities affect Node.js services that deserialize attacker-controlled Protobuf data or generate code from schemas, enabling remote code execution and denial-of-service conditions. Affected CVEs include CVE-2026-44289, CVE-2026-44290, CVE-2026-44291, CVE-2026-44292, CVE-2026-44294, and CVE-2026-44295, with the most critical RCE risk tied to CVE-2026-44291; patches are available in protobufjs 7.5.6 and 8.0.2, and protobufjs-cli 1.2.1 and 2.0.2.

Ivanti has published urgent fixes for its gateway appliances after researchers and watchTowr Labs disclosed a publicly available proof of concept for an Ivanti Sentry remote code execution issue. The affected component is associated with CVE-2026-10520 (CVSS 10), and a related authentication/privilege bypass is tracked as CVE-2026-10523 (CVSS 9.9), which can enable creation of administrative accounts and full administrative access. Because these systems sit at the edge of corporate traffic, unpatched deployments face a heightened risk of full administrative compromise; organizations should review logs and upgrade to versions 10.5.2, 10.6.2, or 10.7.1 immediately.

OpenSSL has released emergency security updates to fix multiple memory-safety flaws in its certificate and QUIC-related code paths, including a use-after-free that can be triggered remotely and lead to Remote Code Execution via CVE-2026-45447. The release also covers additional security issues such as input-validation weaknesses (CVE-2026-34182), nonce handling problems in AES-OCB one-shot operations (CVE-2026-45445), and denial-of-service and crash conditions in the QUIC stack (CVE-2026-34183, CVE-2026-42764, CVE-2026-42765) plus an OCSP stapling double-free hazard (CVE-2026-35188). OpenSSL users are urged to upgrade promptly—e.g., from version 4.0 to version 4.0.1, and from 1.1.1 to 1.1.1zh—because unauthenticated attackers may be able to exploit these problems over the network.

The US CISA has updated its Known Exploited Vulnerabilities catalog/active exploit list by adding three newly identified, in-the-wild flaws. Affected products include Cisco Catalyst SD-WAN Manager (CVE-2026-20245), Arista EOS (CVE-2026-7473), and Google Chromium (CVE-2026-11645), spanning command-injection, tunneling/decapsulation weaknesses, and memory-safety issues that can lead to remote code execution. Because attackers are already targeting these weaknesses, organizations should prioritize patching and remediation immediately.

MBS GmbH disclosed multiple critical security issues in its MBS Universal Gateway devices affecting firmware version V6005 and earlier, including unauthenticated access via a default credential weakness tracked as CVE-2026-35075 (CVSS 9.8) and remotely exploitable stack buffer overflow problems tracked as CVE-2026-35085, CVE-2026-35084, and CVE-2026-35083. The flaws could allow attackers to obtain full root control and, in some cases, read sensitive logs, placing smart building perimeter networks at risk. Administrators should update affected gateways to V6007 immediately to reduce the likelihood of compromise.