{"schemaVersion":3,"id":"CVE-2026-42792","aliases":["UBUNTU-CVE-2026-42792","DEBIAN-CVE-2026-42792"],"status":"published","duplicateOf":null,"title":null,"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.\n\nThe 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.\n\nOn 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.\n\nThis issue affects OTP from OTP 17.0 before OTP 29.0.4, OTP 28.5.0.4 and OTP 27.3.4.15.","dates":{"published":"2026-07-27T14:58:24.426Z","modified":"2026-07-28T09:55:23.932Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":6.3,"severity":"medium","vector":"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","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":6.3,"severity":"medium","vector":"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","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":6.3,"severity":"medium","vector":"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/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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00435,"percentile":0.36371,"severity":"low","asOf":"2026-10-18T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-18T00:00:00.000Z","baselineScore":0.00435},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00802,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00802,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00802,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00802,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00802,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00802,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00435,"percentile":0.36371}],"last30":[{"date":"2026-09-18T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00802,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00802,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00802,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00802,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00802,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00802,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00435,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00435,"percentile":0.36371}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-755","name":"Improper Handling of Exceptional Conditions","description":"The product does not handle or incorrectly handles an exceptional condition.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/755.html"},{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling","description":"The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/770.html"}],"affected":[{"vendor":"debian","product":"erlang","name":"erlang","label":"erlang","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/erlang","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 1:27.3.4.1+dfsg-1+deb13u3","noFixRecorded":false,"fixedIn":null},{"text":"< 1:29.0.4+dfsg-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 1:27.3.4.1+dfsg-1+deb13u3 | < 1:29.0.4+dfsg-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"erlang","name":"erlang","label":"erlang","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/erlang","purlType":"deb","versions":[{"text":"< 1:16.b.3-dfsg-1ubuntu2.2+esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:18.3-dfsg-1ubuntu3.1+esm3","noFixRecorded":false,"fixedIn":null},{"text":"< 1:20.2.2+dfsg-1ubuntu2+esm3","noFixRecorded":false,"fixedIn":null},{"text":"< 1:22.2.7+dfsg-1ubuntu0.5+esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:24.2.1+dfsg-1ubuntu0.7","noFixRecorded":false,"fixedIn":null},{"text":"< 1:25.3.2.8+dfsg-1ubuntu4.7","noFixRecorded":false,"fixedIn":null},{"text":"< 1:27.3.4.6+dfsg-1ubuntu0.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:16.b.3-dfsg-1ubuntu2.2+esm2 | < 1:18.3-dfsg-1ubuntu3.1+esm3 | < 1:20.2.2+dfsg-1ubuntu2+esm3 | < 1:22.2.7+dfsg-1ubuntu0.5+esm2 | < 1:24.2.1+dfsg-1ubuntu0.7 | < 1:25.3.2.8+dfsg-1ubuntu4.7 | < 1:27.3.4.6+dfsg-1ubuntu0.1","eol":null,"hubHref":null},{"vendor":"erlang","product":"erlang\\/otp","name":"Erlang/OTP","label":"erlang\\/otp","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 17.0, < 27.3.4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 28.0, < 28.5.0.4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 29.0, < 29.0.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 17.0, < 27.3.4 | ≥ 28.0, < 28.5.0.4 | ≥ 29.0, < 29.0.4","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"erlang","label":"Erlang","category":"lang"}},"hubHref":"/vendor/erlang/erlangotp"},{"vendor":"erlang","product":"erts","name":"erts","label":"erts","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.0, < 15.2.7.11","noFixRecorded":false,"fixedIn":null},{"text":"≥ 16.0, < 16.4.0.4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 17.0, < 17.0.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.0, < 15.2.7.11 | ≥ 16.0, < 16.4.0.4 | ≥ 17.0, < 17.0.4","eol":null,"hubHref":"/vendor/erlang/erts"},{"vendor":"erlang","product":"otp","name":"OTP","label":"otp","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.0","noFixRecorded":true,"fixedIn":null},{"text":"≥ 17.0","noFixRecorded":true,"fixedIn":null},{"text":"≥ 07b8f441ca711f9812fad9e9115bab3c3aa92f79, < 865d203e4a6a8f44179eced9e1428f9259e4a3bb","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.0 (No fix recorded) | ≥ 17.0 (No fix recorded) | ≥ 07b8f441ca711f9812fad9e9115bab3c3aa92f79, < 865d203e4a6a8f44179eced9e1428f9259e4a3bb","eol":null,"hubHref":"/vendor/erlang/otp"}],"affectedCount":5,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/erlang/otp/security/advisories/GHSA-h6f3-hx58-xhj6","label":"github.com/erlang/otp/security/advisories/GHSA-h6f3-hx58-xhj6","hostname":"github.com","tags":["Vendor Advisory","Related"]},{"url":"https://cna.erlef.org/cves/CVE-2026-42792.html","label":"cna.erlef.org/cves/CVE-2026-42792.html","hostname":"cna.erlef.org","tags":["Related","Patch","Third Party Advisory"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-42792","label":"osv.dev/vulnerability/EEF-CVE-2026-42792","hostname":"osv.dev","tags":["Related","Patch","Third Party Advisory"]},{"url":"https://www.erlang.org/doc/system/versions.html#order-of-versions","label":"www.erlang.org/doc/system/versions.html","hostname":"www.erlang.org","tags":["X Version Scheme","Release Notes"]},{"url":"https://github.com/erlang/otp/commit/865d203e4a6a8f44179eced9e1428f9259e4a3bb","label":"github.com/erlang/otp/commit/865d203e4a6a8f44179eced9e1428f9259e4a3bb","hostname":"github.com","tags":["Patch"]},{"url":"https://ubuntu.com/security/CVE-2026-42792","label":"ubuntu.com/security/CVE-2026-42792","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-42792","label":"www.cve.org/CVERecord?id=CVE-2026-42792","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-8827-1","label":"ubuntu.com/security/notices/USN-8827-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-42792","label":"security-tracker.debian.org/tracker/CVE-2026-42792","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42792","label":"nvd.nist.gov/vuln/detail/CVE-2026-42792","hostname":"nvd.nist.gov","tags":["Oval","Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:11559-1","OPENSUSE-SU-2026:11560-1","RHSA-2026:47009","SUSE-SU-2026:3579-1","SUSE-SU-2026:3645-1","USN-8827-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:11559-1","OPENSUSE-SU-2026:11560-1","SUSE-SU-2026:3579-1","SUSE-SU-2026:3645-1","USN-8827-1"]},"timeline":[{"kind":"published","date":"2026-07-27T14:58:24.426Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-07-28T09:55:23.932Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T07:44:16.169Z","stale":false,"partial":false}}