CVE-2026-47077

Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. hackney_h3:await_response_loop/6 accumulates the HTTP/3 response body in memory without any size cap. The after Timeout clause is a per-message inactivity timer that resets on every received chunk, housekeeping message, or settings frame — it is not a wall-clock deadline. A malicious HTTP/3 server that emits one small chunk every Timeout - 1 ms with Fin = false and never sends a final frame keeps the loop alive indefinitely while the accumulation buffer grows linearly without bound, eventually exhausting the BEAM process heap and causing an out-of-memory condition. 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-2026-47077.html	Patch Third Party Advisory
https://github.com/benoitc/hackney/commit/3d25f9fea26c90609de9d64366fedfe5065413bc	Patch
https://github.com/benoitc/hackney/security/advisories/GHSA-jq4m-q6p2-8gwc	Exploit Patch Vendor Advisory
https://osv.dev/vulnerability/EEF-CVE-2026-47077	Patch Third Party Advisory
https://github.com/benoitc/hackney/security/advisories/GHSA-jq4m-q6p2-8gwc	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-2026-47077

Mitre link : CVE-2026-47077

CVE.ORG link : CVE-2026-47077

JSON object : View

Products Affected

benoitc

hackney

CWE

CWE-400

Uncontrolled Resource Consumption

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The after Timeout clause is a per-message inactivity timer that resets on every received chunk, housekeeping message, or settings frame \u2014 it is not a wall-clock deadline. A malicious HTTP/3 server that emits one small chunk every Timeout - 1 ms with Fin = false and never sends a final frame keeps the loop alive indefinitely while the accumulation buffer grows linearly without bound, eventually exhausting the BEAM process heap and causing an out-of-memory condition.\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 en benoitc hackney permite inundaci\u00f3n. hackney_h3:await_response_loop/6 acumula el cuerpo de la respuesta HTTP/3 en memoria sin ning\u00fan l\u00edmite de tama\u00f1o. La cl\u00e1usula 'after Timeout' es un temporizador de inactividad por mensaje que se reinicia con cada fragmento recibido, mensaje de mantenimiento o trama de configuraci\u00f3n - no es una fecha l\u00edmite de reloj de pared. Un servidor HTTP/3 malicioso que emite un peque\u00f1o fragmento cada Timeout - 1 ms con Fin = false y nunca env\u00eda una trama final mantiene el bucle vivo indefinidamente mientras el b\u00fafer de acumulaci\u00f3n crece linealmente sin l\u00edmite, agotando eventualmente el heap del proceso BEAM y causando una condici\u00f3n de falta de memoria.\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"}