275 lines
12 KiB
JSON
275 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-42786",
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"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"state": "PUBLISHED",
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"assignerShortName": "EEF",
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"dateReserved": "2026-04-29T18:06:33.251Z",
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"datePublished": "2026-05-01T20:34:17.014Z",
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"dateUpdated": "2026-05-27T15:41:06.211Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"collectionURL": "https://repo.hex.pm",
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"cpes": [
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"cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Bandit.WebSocket.Connection'"
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],
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"packageName": "bandit",
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"packageURL": "pkg:hex/bandit",
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"product": "bandit",
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"programFiles": [
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"lib/bandit/websocket/connection.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Bandit.WebSocket.Connection':handle_frame/3"
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}
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],
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"repo": "https://github.com/mtrudel/bandit",
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"vendor": "mtrudel",
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"versions": [
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{
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"lessThan": "1.11.0",
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"status": "affected",
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"version": "0.5.0",
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"versionType": "semver"
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}
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]
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},
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{
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"collectionURL": "https://github.com",
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"cpes": [
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"cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Bandit.WebSocket.Connection'"
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],
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"packageName": "mtrudel/bandit",
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"packageURL": "pkg:github/mtrudel/bandit",
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"product": "bandit",
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"programFiles": [
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"lib/bandit/websocket/connection.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Bandit.WebSocket.Connection':handle_frame/3"
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}
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],
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"repo": "https://github.com/mtrudel/bandit",
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"vendor": "mtrudel",
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"versions": [
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{
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"lessThan": "21612c7c7b1ce43eccd36d3af3a2299d23513667",
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"status": "affected",
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"version": "8909391f486d42138c5308410bc5ea49a65f4d46",
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"versionType": "git"
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}
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]
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}
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],
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"configurations": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>The application must accept WebSocket connections. Applications that expose no WebSocket endpoints are not affected.</p>"
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}
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],
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"value": "The application must accept WebSocket connections. Applications that expose no WebSocket endpoints are not affected."
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"cpeMatch": [
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{
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"criteria": "cpe:2.3:a:mtrudel:bandit:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "1.11.0",
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"versionStartIncluding": "0.5.0",
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"vulnerable": true
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}
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],
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"negate": false,
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"operator": "OR"
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}
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],
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"operator": "AND"
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "Peter Ullrich"
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},
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{
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"lang": "en",
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"type": "remediation developer",
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"value": "Mat Trudel"
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},
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{
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"lang": "en",
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"type": "analyst",
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"value": "Jonatan Männchen / EEF"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion.<p>The fragment reassembly path in <tt>'Elixir.Bandit.WebSocket.Connection':handle_frame/3</tt> in <tt>lib/bandit/websocket/connection.ex</tt> appends every incoming <tt>Continuation{fin: false}</tt> frame's payload to a per-connection iolist with no cumulative size cap. The existing <tt>max_frame_size</tt> option only bounds individual frames; a peer that streams an unbounded number of continuation frames without ever setting <tt>fin=1</tt> grows BEAM heap linearly until the OS or a supervisor kills the process.</p><p>Because the accumulation happens before <tt>WebSock.handle_in/2</tt> is called, the application has no opportunity to interpose a size check. Phoenix Channels and LiveView both run over <tt>WebSock</tt> on Bandit, so a stock Phoenix application exposes this surface as soon as it accepts socket connections.</p><p>This issue affects bandit: from 0.5.0 before 1.11.0.</p>"
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}
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],
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"value": "Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion.\n\nThe fragment reassembly path in 'Elixir.Bandit.WebSocket.Connection':handle_frame/3 in lib/bandit/websocket/connection.ex appends every incoming Continuation{fin: false} frame's payload to a per-connection iolist with no cumulative size cap. The existing max_frame_size option only bounds individual frames; a peer that streams an unbounded number of continuation frames without ever setting fin=1 grows BEAM heap linearly until the OS or a supervisor kills the process.\n\nBecause the accumulation happens before WebSock.handle_in/2 is called, the application has no opportunity to interpose a size check. Phoenix Channels and LiveView both run over WebSock on Bandit, so a stock Phoenix application exposes this surface as soon as it accepts socket connections.\n\nThis issue affects bandit: from 0.5.0 before 1.11.0."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-130",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-130 Excessive Allocation"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV4_0": {
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"attackComplexity": "LOW",
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"attackRequirements": "NONE",
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"attackVector": "NETWORK",
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"baseScore": 8.7,
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"baseSeverity": "HIGH",
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"privilegesRequired": "NONE",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"userInteraction": "NONE",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
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"version": "4.0",
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"vulnAvailabilityImpact": "HIGH",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE"
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},
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-770",
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"description": "CWE-770 Allocation of Resources Without Limits or Throttling",
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"lang": "en",
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"type": "CWE"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"shortName": "EEF",
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"dateUpdated": "2026-05-27T15:41:06.211Z"
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},
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"references": [
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{
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"tags": [
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"vendor-advisory",
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"related"
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],
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"url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-pf94-94m9-536p"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://cna.erlef.org/cves/CVE-2026-42786.html"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://osv.dev/vulnerability/EEF-CVE-2026-42786"
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},
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{
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"tags": [
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"patch"
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],
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"url": "https://github.com/mtrudel/bandit/commit/21612c7c7b1ce43eccd36d3af3a2299d23513667"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"title": "WebSocket fragmented message reassembly unbounded in bandit",
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"x_generator": {
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"engine": "cvelib 1.8.0"
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}
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},
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"adp": [
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{
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"references": [
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{
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"url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-pf94-94m9-536p",
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"tags": [
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"exploit"
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]
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}
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],
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-05-02T01:15:58.376139Z",
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"id": "CVE-2026-42786",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-05-02T01:16:39.704Z"
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}
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}
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]
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}
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} |