CVE-2026-97200

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.

References

https://osv.dev/vulnerability/EEF-CVE-2026-97200

https://github.com/benoitc/hackney/releases/tag/4.9.0

https://github.com/benoitc/hackney/pull/980

https://github.com/benoitc/hackney/commit/dc41b79339ca0c41e16d3f2dd17172bc2de855d6

https://github.com/benoitc/hackney/commit/493e8bf83a391548e5101792276ab3fc428fa76c

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-109837

https://cna.erlef.org/cves/CVE-2026-97200.html

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS