Allocation of Resources Without Limits or Throttling vulnerability in hackneyconn in benoitc hackney allows a malicious HTTP server to…
CVE-2026-97200
Allocation of Resources Without Limits or Throttling vulnerability in hackneyconn 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. hackneyconn:readfullbody/2 and the HTTP/2 and HTTP/3 accumulators append every chunk until the body ends. With {autodecompress, 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.
Assessment
- CVSS
- 8.2 (v4.0)
- Severity
- High
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 26 October 2026
- Last updated
- 26 October 2026
- Weakness
- CWE-409, CWE-770
- Assigner
- 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
At the source
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
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