CVE-2026-97200
Allocation of Resources Without Limits or Throttling vulnerability in hackney_conn in benoitc…
- Risk score
- 54/100
- CVSS
- 8.2 v4.0
- Published
- 26 Oct 2026
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What to know
- What it is
- 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 connect…
- Affected
- See advisory
- Fix
- Upgrade the product to 4.9.0 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 8.2 high
- Remotely exploitable without logging in
References
- https://cna.erlef.org/cves/CVE-2026-97200.html
- https://github.com/benoitc/hackney/commit/493e8bf83a391548e5101792276ab3fc428fa76c
- https://github.com/benoitc/hackney/commit/dc41b79339ca0c41e16d3f2dd17172bc2de855d6
- 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
Original 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.
Last activity 26 Oct 2026. Patch Forecast updates every hour.