CVE-2026-97200
HIGH
8,2
Source: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Confidentiality: N/A
Integrity: N/A
Availability: N/A
Description
Allocation of Resources Without Limits or Throttling vulnerability in hackney_conn in benoitc hackney allows a malicious HTTP server to exhaust client memory via an oversized or highly compressed response body. hackney:request/5 and hackney:body/1 return the whole response body, and nothing bounds how much the connection process buffers. Any server the client requests can trigger it.
hackney_conn:read_full_body/2 and the HTTP/2 and HTTP/3 accumulators append every chunk until the body ends. With {auto_decompress, true} the buffered body is then inflated in one step with zlib:gunzip/1 or zlib:inflate/2, which return the whole output at once.
This issue affects hackney: from 2.0.0-beta.1 before 4.9.0.
409
Improper Handling of Highly Compressed Data (Data Amplification)
IncompleteCommon Consequences
Security Scopes Affected:
Availability
Potential Impacts:
Dos: Amplification
Dos: Crash, Exit, Or Restart
Dos: Resource Consumption (Cpu)
Dos: Resource Consumption (Memory)
Applicable Platforms
All platforms may be affected
770
Allocation of Resources Without Limits or Throttling
IncompleteCommon Consequences
Security Scopes Affected:
Availability
Potential Impacts:
Dos: Resource Consumption (Cpu)
Dos: Resource Consumption (Memory)
Dos: Resource Consumption (Other)
Applicable Platforms
All platforms may be affected
https://cna.erlef.org/cves/CVE-2026-97200.html
https://github.com/benoitc/hackney/commit/493e8bf83a391548e5101792276ab3fc428fa…
https://github.com/benoitc/hackney/commit/dc41b79339ca0c41e16d3f2dd17172bc2de85…
https://github.com/benoitc/hackney/pull/980
https://github.com/benoitc/hackney/releases/tag/4.9.0
https://osv.dev/vulnerability/EEF-CVE-2026-97200