CVE-2026-42792: Improper Handling of Exceptional Conditions vulnerability in Erlang OTP erts (epmd) allows an unauthenticated remote attacker to permanently terminate the…

PriorityP346high7.5CVSS 3.1

AVNACLPRNUINSUCNINAH

EPSS

0.43%

36.3th percentile

Improper Handling of Exceptional Conditions vulnerability in Erlang OTP erts (epmd) allows an unauthenticated remote attacker to permanently terminate the Erlang Port Mapper Daemon (epmd) via connection slot exhaustion. The do_accept function in erts/epmd/src/epmd_srv.c calls epmd_cleanup_exit() when accept(2) returns EMFILE (per-process file descriptor limit reached) or ENFILE (system-wide file descriptor limit reached), rather than treating these as recoverable conditions. An attacker can exhaust epmd's file descriptor slots by holding many TCP connections open while periodically sending a single byte to reset the idle timeout, then causing accept(2) to return EMFILE, which kills the daemon. epmd has no per-source-IP connection cap, making the attack feasible from a single source. On Debian/Ubuntu default packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and repeated daemon deaths trigger systemd's start-rate-limit, permanently failing both epmd.service and epmd.socket and requiring manual operator intervention to recover. This issue affects OTP from OTP 17.0 before OTP 29.0.4, OTP 28.5.0.4 and OTP 27.3.4.15.

Affected

9 ranges

Vendor	Product	Version range	Fixed in
erlang	erlang_otp	>= 17.0 < 27.3.4	27.3.4
erlang	erlang_otp	>= 28.0 < 28.5.0.4	28.5.0.4
erlang	erlang_otp	>= 29.0 < 29.0.4	29.0.4
erlang	erts	>= 16.0 < 16.4.0.4	16.4.0.4
erlang	erts	>= 17.0 < 17.0.4	17.0.4
erlang	erts	>= 6.0 < 15.2.7.11	15.2.7.11
erlang	otp	>= 07b8f441ca711f9812fad9e9115bab3c3aa92f79 < 865d203e4a6a8f44179eced9e1428f9259e4a3bb	865d203e4a6a8f44179eced9e1428f9259e4a3bb
erlang	otp	>= 17.0 < *	*
erlang	otp	>= 6.0 < *	*

CVSS provenance

nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvdv4.06.3MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

vendor_redhat6.3MEDIUM

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