CVE-2026-47067 (GCVE-0-2026-47067)
Vulnerability from cvelistv5 – Published: 2026-05-25 14:00 – Updated: 2026-05-27 15:41
VLAI
Title
Atom table exhaustion via unrecognized URL schemes in hackney
Summary
Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. The URL parser in src/hackney_url.erl converts every unrecognized URL scheme to a permanent BEAM atom via binary_to_atom/2. BEAM atoms are never garbage-collected and the atom table defaults to a hard limit of 1,048,576 entries. An attacker who can supply URLs with attacker-chosen scheme prefixes — directly as request targets, as configured webhook URLs, or via Location headers followed during redirects — can exhaust the atom table and crash the entire BEAM VM with system_limit.
This issue affects hackney: from 2.0.0 before 4.0.1.
Severity
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/benoitc/hackney/security/advis… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-47067.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-47067 | related |
| https://github.com/benoitc/hackney/commit/31f6f0e… | patch |
Impacted products
Credits
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-47067",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-26T15:45:32.232194Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-26T15:45:36.464Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"hackney_url"
],
"packageName": "hackney",
"packageURL": "pkg:hex/hackney",
"product": "hackney",
"programFiles": [
"src/hackney_url.erl"
],
"programRoutines": [
{
"name": "hackney_url:parse_url/1"
}
],
"repo": "https://github.com/benoitc/hackney",
"vendor": "benoitc",
"versions": [
{
"lessThan": "4.0.1",
"status": "affected",
"version": "2.0.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"hackney_url"
],
"packageName": "benoitc/hackney",
"packageURL": "pkg:github/benoitc/hackney",
"product": "hackney",
"programFiles": [
"src/hackney_url.erl"
],
"programRoutines": [
{
"name": "hackney_url:parse_url/1"
}
],
"repo": "https://github.com/benoitc/hackney",
"vendor": "benoitc",
"versions": [
{
"lessThan": "31f6f0e27e096ad88743dfded4f030a3ee74972e",
"status": "affected",
"version": "d9713695c0d99855d12c73fd8a0b4be0543950c4",
"versionType": "git"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.0.1",
"versionStartIncluding": "2.0.0",
"vulnerable": true
}
],
"negate": false,
"operator": "AND"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Benoit Chesneau"
},
{
"lang": "en",
"type": "analyst",
"value": "Jonatan M\u00e4nnchen / EEF"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding.\u003cp\u003eThe URL parser in \u003ctt\u003esrc/hackney_url.erl\u003c/tt\u003e converts every unrecognized URL scheme to a permanent BEAM atom via \u003ctt\u003ebinary_to_atom/2\u003c/tt\u003e. BEAM atoms are never garbage-collected and the atom table defaults to a hard limit of 1,048,576 entries. An attacker who can supply URLs with attacker-chosen scheme prefixes \u2014 directly as request targets, as configured webhook URLs, or via \u003ctt\u003eLocation\u003c/tt\u003e headers followed during redirects \u2014 can exhaust the atom table and crash the entire BEAM VM with \u003ctt\u003esystem_limit\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThis issue affects hackney: from 2.0.0 before 4.0.1.\u003c/p\u003e"
}
],
"value": "Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. The URL parser in src/hackney_url.erl converts every unrecognized URL scheme to a permanent BEAM atom via binary_to_atom/2. BEAM atoms are never garbage-collected and the atom table defaults to a hard limit of 1,048,576 entries. An attacker who can supply URLs with attacker-chosen scheme prefixes \u2014 directly as request targets, as configured webhook URLs, or via Location headers followed during redirects \u2014 can exhaust the atom table and crash the entire BEAM VM with system_limit.\n\nThis issue affects hackney: from 2.0.0 before 4.0.1."
}
],
"impacts": [
{
"capecId": "CAPEC-125",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-125 Flooding"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.7,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"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",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-770",
"description": "CWE-770 Allocation of Resources Without Limits or Throttling",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-27T15:41:27.821Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-47067.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-47067"
},
{
"tags": [
"patch"
],
"url": "https://github.com/benoitc/hackney/commit/31f6f0e27e096ad88743dfded4f030a3ee74972e"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Atom table exhaustion via unrecognized URL schemes in hackney",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-47067",
"datePublished": "2026-05-25T14:00:48.507Z",
"dateReserved": "2026-05-18T17:28:08.321Z",
"dateUpdated": "2026-05-27T15:41:27.821Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-47067",
"date": "2026-05-27",
"epss": "0.00042",
"percentile": "0.13129"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-47067\",\"sourceIdentifier\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"published\":\"2026-05-25T15:16:21.740\",\"lastModified\":\"2026-05-27T13:52:12.510\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. The URL parser in src/hackney_url.erl converts every unrecognized URL scheme to a permanent BEAM atom via binary_to_atom/2. BEAM atoms are never garbage-collected and the atom table defaults to a hard limit of 1,048,576 entries. An attacker who can supply URLs with attacker-chosen scheme prefixes \u2014 directly as request targets, as configured webhook URLs, or via Location headers followed during redirects \u2014 can exhaust the atom table and crash the entire BEAM VM with system_limit.\\n\\nThis issue affects hackney: from 2.0.0 before 4.0.1.\"}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"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/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\",\"baseScore\":8.7,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"HIGH\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-770\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.0.0\",\"versionEndExcluding\":\"4.0.1\",\"matchCriteriaId\":\"B119C170-E9CA-4AEE-BE04-F074E70CBF82\"}]}]}],\"references\":[{\"url\":\"https://cna.erlef.org/cves/CVE-2026-47067.html\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"tags\":[\"Third Party Advisory\",\"Patch\"]},{\"url\":\"https://github.com/benoitc/hackney/commit/31f6f0e27e096ad88743dfded4f030a3ee74972e\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"tags\":[\"Patch\"]},{\"url\":\"https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"tags\":[\"Exploit\",\"Vendor Advisory\",\"Patch\"]},{\"url\":\"https://osv.dev/vulnerability/EEF-CVE-2026-47067\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"tags\":[\"Third Party Advisory\",\"Patch\"]},{\"url\":\"https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"tags\":[\"Exploit\",\"Vendor Advisory\",\"Patch\"]}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-47067\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-26T15:45:32.232194Z\"}}}], \"references\": [{\"url\": \"https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-26T15:45:07.470Z\"}}], \"cna\": {\"title\": \"Atom table exhaustion via unrecognized URL schemes in hackney\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Peter Ullrich\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Benoit Chesneau\"}, {\"lang\": \"en\", \"type\": \"analyst\", \"value\": \"Jonatan M\\u00e4nnchen / EEF\"}], \"impacts\": [{\"capecId\": \"CAPEC-125\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-125 Flooding\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 8.7, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"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\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/benoitc/hackney\", \"vendor\": \"benoitc\", \"modules\": [\"hackney_url\"], \"product\": \"hackney\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.0.0\", \"lessThan\": \"4.0.1\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:hex/hackney\", \"packageName\": \"hackney\", \"programFiles\": [\"src/hackney_url.erl\"], \"collectionURL\": \"https://repo.hex.pm\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"hackney_url:parse_url/1\"}]}, {\"cpes\": [\"cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/benoitc/hackney\", \"vendor\": \"benoitc\", \"modules\": [\"hackney_url\"], \"product\": \"hackney\", \"versions\": [{\"status\": \"affected\", \"version\": \"d9713695c0d99855d12c73fd8a0b4be0543950c4\", \"lessThan\": \"31f6f0e27e096ad88743dfded4f030a3ee74972e\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/benoitc/hackney\", \"packageName\": \"benoitc/hackney\", \"programFiles\": [\"src/hackney_url.erl\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"hackney_url:parse_url/1\"}]}], \"references\": [{\"url\": \"https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-47067.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-47067\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/benoitc/hackney/commit/31f6f0e27e096ad88743dfded4f030a3ee74972e\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. The URL parser in src/hackney_url.erl converts every unrecognized URL scheme to a permanent BEAM atom via binary_to_atom/2. BEAM atoms are never garbage-collected and the atom table defaults to a hard limit of 1,048,576 entries. An attacker who can supply URLs with attacker-chosen scheme prefixes \\u2014 directly as request targets, as configured webhook URLs, or via Location headers followed during redirects \\u2014 can exhaust the atom table and crash the entire BEAM VM with system_limit.\\n\\nThis issue affects hackney: from 2.0.0 before 4.0.1.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding.\u003cp\u003eThe URL parser in \u003ctt\u003esrc/hackney_url.erl\u003c/tt\u003e converts every unrecognized URL scheme to a permanent BEAM atom via \u003ctt\u003ebinary_to_atom/2\u003c/tt\u003e. BEAM atoms are never garbage-collected and the atom table defaults to a hard limit of 1,048,576 entries. An attacker who can supply URLs with attacker-chosen scheme prefixes \\u2014 directly as request targets, as configured webhook URLs, or via \u003ctt\u003eLocation\u003c/tt\u003e headers followed during redirects \\u2014 can exhaust the atom table and crash the entire BEAM VM with \u003ctt\u003esystem_limit\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThis issue affects hackney: from 2.0.0 before 4.0.1.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"CWE-770 Allocation of Resources Without Limits or Throttling\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.0.1\", \"versionStartIncluding\": \"2.0.0\"}], \"operator\": \"AND\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-05-27T15:41:27.821Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-47067\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-27T15:41:27.821Z\", \"dateReserved\": \"2026-05-18T17:28:08.321Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-05-25T14:00:48.507Z\", \"assignerShortName\": \"EEF\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…