CVE-2026-59903
An attacker can exploit multiple vulnerabilities in Netty to bypass security measures, conduct a denial of service attack, and disclose information.
CSIRTS triage
- What
- Multiple vulnerabilities enable security bypass, denial of service, and information disclosure in Netty.
- Who is affected
- All deployments of affected Netty versions are exposed to remote attacks.
- Urgency
- Medium severity; no active exploitation reported but multiple attack vectors present.
- Action
- Identify and update to patched Netty version; review security posture for any bypassed measures.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all EPSS-scored CVEs.
Advisory coverage (3)
- medium[NEW] [medium] Netty: Multiple vulnerabilitiescert-bund · 2026-08-25
- mediumGHSA-8c42-7qj2-3j46: Netty Vulnerable to Cache Poisoning and Information Disclosure via CORS Vary Header Overw…ghsa · 2026-08-17
- mediumCVE-2026-59903: Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final a…nvd · 2026-08-17
External references
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[](https://www.csirts.com/cve/CVE-2026-59903)