{"id":"GHSA-w573-9ffj-6ff9","summary":"Netty: Unix-socket fd receive leaks descriptors when peer sends two at once","details":"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-\u003ecmsg_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).","aliases":["CVE-2026-45536"],"modified":"2026-07-17T21:07:33.059270457Z","published":"2026-06-08T23:01:33Z","database_specific":{"github_reviewed_at":"2026-06-08T23:01:33Z","nvd_published_at":"2026-06-12T15:16:27Z","cwe_ids":["CWE-200","CWE-772"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/netty/netty/security/advisories/GHSA-w573-9ffj-6ff9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45536"},{"type":"PACKAGE","url":"https://github.com/netty/netty"},{"type":"WEB","url":"https://github.com/netty/netty/releases/tag/netty-4.1.135.Final"},{"type":"WEB","url":"https://github.com/netty/netty/releases/tag/netty-4.2.15.Final"}],"affected":[{"package":{"name":"io.netty:netty-transport-native-epoll","ecosystem":"Maven","purl":"pkg:maven/io.netty/netty-transport-native-epoll"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.0.Final"},{"fixed":"4.2.15.Final"}]}],"versions":["4.2.0.Final","4.2.1.Final","4.2.10.Final","4.2.11.Final","4.2.12.Final","4.2.13.Final","4.2.14.Final","4.2.2.Final","4.2.3.Final","4.2.4.Final","4.2.5.Final","4.2.6.Final","4.2.7.Final","4.2.8.Final","4.2.9.Final"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-w573-9ffj-6ff9/GHSA-w573-9ffj-6ff9.json","last_known_affected_version_range":"\u003c= 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