{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-116539","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-10-26T14:30:57.254Z","datePublished":"2026-10-26T14:59:39.460Z","dateUpdated":"2026-10-26T14:59:39.460Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-10-26T14:59:39.460Z"},"datePublic":"2026-08-07T00:00:00.000Z","title":"Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO","descriptions":[{"lang":"en","value":"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."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Out-of-bounds Write","cweId":"CWE-787","type":"CWE"}]}],"affected":[{"vendor":"netty","product":"netty-tcnative","collectionURL":"https://repo1.maven.org/maven2/io/netty/netty-tcnative/","packageName":"io.netty:netty-tcnative","repo":"https://github.com/netty/netty-tcnative","defaultStatus":"unaffected","packageURL":"pkg:maven/io.netty/netty-tcnative","versions":[{"version":"0","lessThan":"2.0.84.Final","status":"affected","versionType":"custom"}]},{"vendor":"netty","product":"netty-tcnative-boringssl-static","collectionURL":"https://repo1.maven.org/maven2/io/netty/netty-tcnative-boringssl-static/","packageName":"io.netty:netty-tcnative-boringssl-static","repo":"https://github.com/netty/netty-tcnative","defaultStatus":"unaffected","packageURL":"pkg:maven/io.netty/netty-tcnative-boringssl-static","versions":[{"version":"0","lessThan":"2.0.84.Final","status":"affected","versionType":"custom"}]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM"}}],"references":[{"url":"https://github.com/netty/netty-tcnative/security/advisories/GHSA-gf9q-9mg7-g5qh","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-gf9q-9mg7-g5qh)"},{"url":"https://github.com/netty/netty-tcnative/commit/92dd66fd1243d85c05a61288f96367a70260b6b8","tags":["patch"],"name":"Patch Commit"},{"url":"https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/ssl.c#L199","tags":["technical-description"]},{"url":"https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final","tags":["release-notes"],"name":"netty-tcnative netty-tcnative-parent-2.0.84.Final Release Notes"},{"url":"https://github.com/netty/netty-tcnative","tags":["product"]},{"name":"VulnCheck Advisory: Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-heap-buffer-overflow-via-openssl-bio"}],"credits":[{"lang":"en","value":"Yu Bao, PayPal Cyber Security Team","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}}}}