CVE-2026-116539: netty netty-tcnative

Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO

CVSS 8.2 HighEPSS 0.0040 · 33rd percentile

Published by the CVE Program (CNA: VulnCheck) at 26 Oct 2026, 14:59 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
netty	netty-tcnative Package name: io.netty:netty-tcnative https://repo1.maven.org/maven2/io/netty/netty-tcnative/ pkg:maven/io.netty/netty-tcnative	affected before 2.0.84.Final custom Other versions: unaffected
netty	netty-tcnative-boringssl-static Package name: io.netty:netty-tcnative-boringssl-static https://repo1.maven.org/maven2/io/netty/netty-tcnative-boringssl-static/ pkg:maven/io.netty/netty-tcnative-boringssl-static	affected before 2.0.84.Final custom Other versions: unaffected

Identifiers

CVE-2026-116539

CNA

VulnCheck

Weakness (CWE)

CWE-787

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.2	High	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	CNA (VulnCheck)Used for this record
5.9	Medium	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0040, the 33rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

26 Oct 2026, 14:59 UTC Confirmed by the CVE List
26 Oct 2026, 16:17 UTC Confirmed by NVD

Sources

References from the CNA

github.com/netty/netty-tcnative/security/advisories/GHSA-gf9q-9mg7-g5qh vendor-advisory
github.com/netty/netty-tcnative/commit/92dd66fd1243d85c05a61288f96367a70260b6b8 patch
github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/ssl.c#L199 technical-description
github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final release-notes
github.com/netty/netty-tcnative product
www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-heap-buffer-overflow-via-openssl-bio third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.