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Back to active CVEs
High · CVSS 8.2CVE-2026-97200

Unbounded response body buffering and decompression in hackneyCVE-2026-97200

Answer in brief

CVE-2026-97200 records a High severity (CVSS 8.2) vulnerability in Unbounded response body buffering and decompression in hackney. The current sources do not mark it as known exploited. The current feed maps benoitc/benoitc/hackney (generic), benoitc/hackney (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 26, 2026Updated Oct 26, 2026Source checked Oct 26, 2026First seen by HOL Oct 26, 2026Material review Oct 26, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.2
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps benoitc/benoitc/hackney (generic), benoitc/hackney (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
benoitc/benoitc/hackneygeneric>=dc41b79339ca0c41e16d3f2dd17172bc2de855d6 <493e8bf83a391548e5101792276ab3fc428fa76c493e8bf83a391548e5101792276ab3fc428fa76c
benoitc/hackneygeneric>=2.0.0-beta.1 <4.9.04.9.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for benoitc/benoitc/hackney, benoitc/hackney.
  2. 2Review the reported fix. Source-reported workaround: Leave auto_decompress disabled (the default). Without it hackney_conn:maybe_decompress_body/2 never inflates the body, which closes the amplification half. The uncapped raw body read has no workaround.

Evidence timeline and material changes

  1. Published upstream

    Oct 26, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 26, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 26, 2026

Sources and claim methodology

  • Source referencecna.erlef.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceosv.dev
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Apache Vysper: Unbounded allocationAlso CWE-770
  • Unbounded memory consumption during PDF text extractionAlso CWE-409

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-409, CWE-770
Source
CVE List V5
Source checked
Oct 26, 2026
References
6 linked sources
Open source record