# CVE-2026-45536

## Summary

- **CVE ID:** CVE-2026-45536
- **Severity:** MEDIUM
- **CVSS Score:** 4 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
- **CWE:** CWE-200, CWE-772
- **Published:** Jun 12, 2026
- **Last Modified:** Jun 12, 2026

## 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.

## Affected Products

- netty — netty (>= 4.2.0.Final, < 4.2.15.Final)
- netty — netty (< 4.1.135.Final)

## References

- [CNA](https://github.com/netty/netty/security/advisories/GHSA-w573-9ffj-6ff9)
- [CNA](https://github.com/netty/netty/releases/tag/netty-4.1.135.Final)
- [CNA](https://github.com/netty/netty/releases/tag/netty-4.2.15.Final)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.14%
- **EPSS Percentile:** 3.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._