[NEW] [medium] Netty: Multiple vulnerabilities

mediumCVE-2026-59902 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

vendor: Netty product: Netty Authentication bypass Denial of service Information disclosure

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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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-08-25
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2712

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-599020.68% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 50% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-599030.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-59902	coverage & exploitation status	NVD · CVE.org
CVE-2026-59903	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Netty

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

lowCVE-2026-76816: Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.13…nvd · 2026-08-24
unknownCVE-2026-62380: Netty (io.netty:netty-codec-socks) versions 4.2.0.Final through 4.2.16.Final and 4.1.x through…nvd · 2026-08-22
highCVE-2026-62243: Netty (io.netty:netty-handler) versions from 4.2.0.Final through 4.2.16.Final and versions thr…nvd · 2026-08-22
highGHSA-4899-mpch-38p3: netty-incubator-codec-ohttp BinaryHttpParser: Unauthenticated CPU-exhaustion DoS via infi…ghsa · 2026-08-20
highGHSA-hmq9-67w8-j5pw: netty-incubator-codec-ohttp: BinaryHttpParser should enforce limits for variable lengths …ghsa · 2026-08-20
highGHSA-8cfx-wx3q-mh5q: netty-incubator-codec-ohttp: Binary HTTP parser infinite loop on known-length field secti…ghsa · 2026-08-20