CVE-2026-45536
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 4
- CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- EPSS probability
- 0.14%
- CWE
- CWE-200, CWE-772
- Published
- 2026-06-12
- Last modified
- 2026-06-12
Affected products
- netty netty
- netty netty
Weakness type
Related vulnerabilities
- CVE-2026-88059 — Angular: Information Leak via `HttpTransferCache` Bypass When Using `withRequestsMadeViaParent`
- CVE-2026-88013 — rclone: http backend forwards custom/auth headers to a different host on redirect
- CVE-2026-88893 — OpenPanel Unauthenticated Share Lookup Information Disclosure
- CVE-2026-88876 — AVideo PlayerSkins seo.php Missing Authorization Password-Protected VOD
- CVE-2026-88874 — AVideo through c3edcc274c389816d434acadac07ee78eaf330c1 Authentication Bypass
- CVE-2026-0305 — Prisma Access Agent: Information Disclosure Vulnerability on Linux
- CVE-2026-87017 — Open WebUI: Inaccessible knowledge bases are exposed through the built-in knowledge tool on most vector backends
- CVE-2026-86767 — Snipe-IT before 8.7.0 Cross-Company Read via requested-assets