Bug 2560878 (CVE-2026-116539)

Summary: CVE-2026-116539 io.netty/netty-tcnative: netty-tcnative: Denial of Service via heap buffer overflow
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: fmariani, gmalinko, janstey, jwon, mcarlett, pdelbell, pjindal, rstepani, tcunning, yfang
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in netty-tcnative. A remote attacker can cause a denial of service (DoS) by sending specially crafted Transport Layer Security (TLS) messages. Due to improper buffer index handling, incoming data triggers a heap-based buffer overflow and an out-of-bounds memory write, which crashes the Java Virtual Machine (JVM) process.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-26 15:31:54 UTC 
Netty netty-tcnative before 2.0.84.Final contains a heap buffer overflow vulnerability in the tcn_write_to_bytebuffer BIO callback caused by failing to wrap the non-application ring buffer write index. Remote TLS peers can drive handshake, renegotiation, or post-handshake messages into this buffer, triggering an out-of-bounds memcpy that crashes the JVM process.