CVE-2026-47067

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://cna.erlef.org/cves/CVE-2026-47067.html	Patch Third Party Advisory
https://github.com/benoitc/hackney/commit/31f6f0e27e096ad88743dfded4f030a3ee74972e	Patch
https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62	Exploit Patch Vendor Advisory
https://osv.dev/vulnerability/EEF-CVE-2026-47067	Patch Third Party Advisory
https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62	Exploit Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-25 15:16

Updated : 2026-07-24 10:10

NVD link : CVE-2026-47067

Mitre link : CVE-2026-47067

CVE.ORG link : CVE-2026-47067

JSON object : View

Products Affected

benoitc

hackney

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

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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."}, {"lang": "es", "value": "Vulnerabilidad de asignaci\u00f3n de recursos sin l\u00edmites ni limitaci\u00f3n de velocidad en benoitc hackney permite inundaci\u00f3n. El analizador de URL en src/hackney_url.erl convierte cada esquema de URL no reconocido en un \u00e1tomo BEAM permanente a trav\u00e9s de binary_to_atom/2. Los \u00e1tomos BEAM nunca se recolectan y la tabla de \u00e1tomos tiene por defecto un l\u00edmite estricto de 1.048.576 entradas. Un atacante que puede suministrar URL con prefijos de esquema elegidos por el atacante - directamente como objetivos de solicitud, como URL de webhook configuradas, o a trav\u00e9s de encabezados Location seguidos durante las redirecciones - puede agotar la tabla de \u00e1tomos y colapsar toda la VM BEAM con system_limit.\n\nEste problema afecta a hackney: desde 2.0.0 antes de 4.0.1."}], "lastModified": "2026-07-24T10:10:00.197", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B119C170-E9CA-4AEE-BE04-F074E70CBF82", "versionEndExcluding": "4.0.1", "versionStartIncluding": "2.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}