A vulnerability identified as problematic has been detected in Netty. Affected is the function setVaryHeader of the file io.netty.handler.codec.http.cors.CorsHandler of the component CorsHandler. The manipulation leads to information disclosure. This vulnerability is traded as CVE-2026-59903. It is possible to initiate the attack remotely. There... Weiterlesen
Intelligence View
CVE-2026-59903 | Netty prior 4.1.137.Final/4.2.17.Final CorsHandler io.netty.handler.codec.http.cors.CorsHandler setVaryHeader information disclosure
A vulnerability identified as problematic has been detected in Netty. Affected is the function setVaryHeader of the file io.netty.handler.codec.http.cors.CorsHandler of the component CorsHandler. The manipulation leads to information…
SOC Incident Playbook: Vulnerability Remediation & Verification
title: Detect Exploitation - CVE-2026-59903 | Netty prior 4.1.137.Final/4.2.17.Final CorsHandler io.netty.handler.codec.http.cors.CorsHandler setVaryHeader information disclosure
id: 3e1063f3-ab03-4325-939c-e303ab8946eb
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
- https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-24
logsource:
category: network_connection
product: any
detection:
selection:
CommandLine|contains:
- 'exploit'
condition: selection
falsepositives:
- Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
- attack.initial_accessrule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-24"
description = "YARA Signature for "
strings:
$str = "CVE-2026-59903 | Netty prior 4" ascii wide
condition:
any of them
}tsecurity.de Cognitive Threat RAG
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich CVE-2026-59903 | Netty prior 4.1.137.Fin.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
Netzwerk/Remote-Zugriff ohne Vorauthentifizierung möglich.
- 1. Perimeter-Inspektion: Relevante Portfreigaben und exponierte Endpunkte unverzüglich scannen.
- 2. Patch-Applikation: Hersteller-Hotfix einspielen oder betroffene Daemons in isolierte DMZ-Segmente überführen.
- 3. Telemetrie & EDR-Alerts: Prozessaufrufe und Child-Processes auf anomale Shell-Spawns überwachen.
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