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Medium severity4.0NVD Advisory· Published Jun 12, 2026· Updated Jun 15, 2026

CVE-2026-45536

CVE-2026-45536

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-transport-native-epollMaven
>= 4.2.0.Final, < 4.2.15.Final4.2.15.Final
io.netty:netty-transport-native-kqueueMaven
>= 4.2.0.Final, < 4.2.15.Final4.2.15.Final
io.netty:netty-transport-native-kqueueMaven
< 4.1.135.Final4.1.135.Final
io.netty:netty-transport-native-epollMaven
< 4.1.135.Final4.1.135.Final

Affected products

161

Patches

Vulnerability mechanics

References

5

News mentions

1