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CVE-2026-42792— epmd permanent DoS via EMFILE on accept(2) in erts

Quick assessment

Affected

Erlang OTP

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Erlang OTP是瑞典Erlang社区的一套构建分布式系统的中间件平台。 Erlang OTP 16.0版本和17.0版本存在安全漏洞，该漏洞源于异常条件处理不当，do_accept函数在accept返回EMFILE或ENFILE时调用epmd_cleanup_exit终止守护进程，可能导致未经验证的远程攻击者通过连接槽耗尽永久终止Erlang Port Mapper Daemon (epmd)。

CVSS 6.3 · Medium EPSS 0.43% · P38 Updated Jul 28, 2026

Possible ATT&CK Techniques 2 AI

T1498 · Network Denial of Service T1499 · Endpoint Denial of Service

Affected Version Matrix 3

Vendor	Product	Version Range	Status
Erlang	OTP	`6.0< *`	affected
		`17.0< *`	affected
		`07b8f441ca711f9812fad9e9115bab3c3aa92f79< 865d203e4a6a8f44179eced9e1428f9259e4a3bb`	affected

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I. Basic Information for CVE-2026-42792

Vulnerability Information

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Vulnerability Title

epmd permanent DoS via EMFILE on accept(2) in erts

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

对异常条件的处理不恰当

Source: CVE Program / CVE List V5

Vulnerability Title

Erlang OTP 异常处理不当漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Erlang	OTP	6.0 ~ *	`cpe:2.3:a:erlang:erlang\/otp::::::::`
Erlang	OTP	17.0 ~ *	`cpe:2.3:a:erlang:erlang\/otp::::::::`

II. Public POCs for CVE-2026-42792

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-42792

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Patches & Fixes for CVE-2026-42792 (1)

🔗 epmd: Improve slow-connection handling · erlang/otp@865d203 · GitHub Read full article patch

Vendor Advisories for CVE-2026-42792 (3)

🔗 epmd permanent DoS via EMFILE on accept(2) in erts | Erlang Ecosystem Foundation CNA Read full article related
🔗 EEF-CVE-2026-42792 - OSV Read full article related
🔗 epmd: Denial-of-service via accept(EMFILE) · Advisory · erlang/otp · GitHub Read full article vendor-advisory related

https://www.cve.org/CVERecord?id=CVE-2026-42792

Same Patch Batch · Erlang · 2026-07-27 · 8 CVEs total

CVE-2026-55953	9.1 CRITICAL	TLS 1.2 and DTLS client accepts unoffered anonymous cipher suite, bypassing server authent
CVE-2026-58227	8.7 HIGH	TLS/DTLS denial of service via unbounded recursion on cross-signed peer certificate chain
CVE-2026-59251	8.7 HIGH	Denial of service via exponential certificate policy tree growth in path validation
CVE-2026-59250	8.3 HIGH	Megaco flex scanner buffer overflow via oversized property parm name
CVE-2026-54890	8.2 HIGH	BEAM VM crash via integer underflow in binary_to_term BIT_BINARY_EXT decoding
CVE-2026-55737	5.1 MEDIUM	Heap pointer corruption via signed/unsigned mismatch in LARGE_TUPLE_EXT decoding in erts e
CVE-2026-47078	4.8 MEDIUM	Relative path traversal in zip:unzip/zip:extract via check_dir_level depth-counter bypass

IV. Related Vulnerabilities

Same product: OTP

Same vendor: Erlang

Same weakness: CWE-755