CVE-2026-47077

HIGH EPSS 48.6%
Published May 25, 20261mo ago · Modified Jun 17, 20262w ago
8.2 CVSS 4.0
High
Find Similar
Published May 25, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

Description

Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. hackney_h3:await_response_loop/6 accumulates the HTTP/3 response body in memory without any size cap. The after Timeout clause is a per-message inactivity timer that resets on every received chunk, housekeeping message, or settings frame — it is not a wall-clock deadline. A malicious HTTP/3 server that emits one small chunk every Timeout - 1 ms with Fin = false and never sends a final frame keeps the loop alive indefinitely while the accumulation buffer grows linearly without bound, eventually exhausting the BEAM process heap and causing an out-of-memory condition. This issue affects hackney: from 2.0.0 before 4.0.1.

CVSS Details

Base Score
8.2
Exploitability
—
Impact
—
Vector string
CVSS: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
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
48.6% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-400 Uncontrolled Resource Consumption Resource Mgmt

Affected Products 1

VendorProductVersionRange
benoitchackney*≥2.0.0  –  <4.0.1

References 4

  • cna.erlef.org https://cna.erlef.org/cves/CVE-2026-47077.html
    PatchThird Party Advisory
  • github.com https://github.com/benoitc/hackney/commit/3d25f9fea26c90609de9d64366fedfe5065413bc
    Patch
  • github.com https://github.com/benoitc/hackney/security/advisories/GHSA-jq4m-q6p2-8gwc
    ExploitPatchVendor Advisory
  • osv.dev https://osv.dev/vulnerability/EEF-CVE-2026-47077
    PatchThird Party Advisory

Remediation

  • cna.erlef.org https://cna.erlef.org/cves/CVE-2026-47077.html
    PatchThird Party Advisory
  • github.com https://github.com/benoitc/hackney/commit/3d25f9fea26c90609de9d64366fedfe5065413bc
    Patch
  • github.com https://github.com/benoitc/hackney/security/advisories/GHSA-jq4m-q6p2-8gwc
    ExploitPatchVendor Advisory
  • osv.dev https://osv.dev/vulnerability/EEF-CVE-2026-47077
    PatchThird Party Advisory