Information Disclosure in io.netty:netty-transport-native-epoll (CVE-2026-45536)
Summary
Vulnerability in io.netty:netty-transport-native-epoll (CVE-2026-45536). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 4.1.135.Final or later.
Original description
The description as published by the source.
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, netty_unix_socket_recvFd sets msg_control to char control[CMSG_SPACE(sizeof(int))] (line 940) — 24 bytes on 64-bit Linux. A peer-sent SCM_RIGHTS cmsg carrying two ints has cmsg_len = CMSG_LEN(8) = 24, which fits exactly with no MSG_CTRUNC, so the kernel installs both fds in the receiving process. The subsequent check cmsg->cmsg_len == CMSG_LEN(sizeof(int)) (line 972, expected 20) fails, the branch that would read the fd is skipped, and neither installed fd is closed. The for(;;) loop calls recvmsg again (non-blocking → EAGAIN → Java maps to 0 → read loop exits normally), leaving two leaked fds per message. There is no MSG_CTRUNC handling. Reachable via Epoll/KQueue DomainSocketChannel when the application opts into DomainSocketReadMode.FILE_DESCRIPTORS (non-default). Versions 4.1.135.Final and 4.2.15.Final patch the issue.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-45536 has been found in io.netty:netty-transport-native-epoll.
Risk of unauthorized operations or information disclosure. CVSS score: 4.0/10.
What to do: upgrade io.netty:netty-transport-native-epoll to 4.1.135.Final or later.
If unsure, ask your IT team or search "io.netty:netty-transport-native-epoll CVE-2026-45536" on the vendor's site.
CVE-2026-45536 (io.netty:netty-transport-native-epoll) — CWE-200 / CVSS v3 4.0
Attack vector: local / unauthenticated / no user interaction
Patched: 4.1.135.Final — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Information disclosure (CWE-200) exists in io.netty:netty-transport-native-epoll.
Check the vendor advisory for the affected versions of io.netty:netty-transport-native-epoll.
Severity: Medium (CVSS 4.0/10). Risk of unauthorized operations or information disclosure.
Update to 4.1.135.Final.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで io.netty:netty-transport-native-epoll を使っているサービスとバージョンを洗い出す。
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2Apply patch patch
Upgrade io.netty:netty-transport-native-epoll to 4.1.135.Finalステージング環境で 4.1.135.Final に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-45536 netty
- Ubuntu UBUNTU-CVE-2026-45536 netty
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- web github.com
- web github.com
- web github.com