Recommended action

Update io.netty:netty-transport-native-epoll to 4.2.15.Final; io.netty:netty-transport-native-epoll to 4.1.135.Final; io.netty:netty-transport-native-kqueue to 4.2.15.Final; io.netty:netty-transport-native-kqueue to 4.1.135.Final if you use the affected versions. Test the change in a non-production environment first.

hol-guard supply-chain scan

What this means

Netty: Unix-socket fd receive leaks descriptors when peer sends two at once affects io.netty:netty-transport-native-epoll (maven), io.netty:netty-transport-native-epoll (maven), io.netty:netty-transport-native-kqueue (maven), io.netty:netty-transport-native-kqueue (maven). Severity is medium. 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).

AI coding agents often install or upgrade packages automatically in maven. A medium vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.

Affected software

Recommended action

Update io.netty:netty-transport-native-epoll to 4.2.15.Final; io.netty:netty-transport-native-epoll to 4.1.135.Final; io.netty:netty-transport-native-kqueue to 4.2.15.Final; io.netty:netty-transport-native-kqueue to 4.1.135.Final if you use the affected versions. Test the change in a non-production environment first.

hol-guard supply-chain scan

What this means

Netty: Unix-socket fd receive leaks descriptors when peer sends two at once affects io.netty:netty-transport-native-epoll (maven), io.netty:netty-transport-native-epoll (maven), io.netty:netty-transport-native-kqueue (maven), io.netty:netty-transport-native-kqueue (maven). Severity is medium. 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).

AI coding agents often install or upgrade packages automatically in maven. A medium vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.

Affected software