CVEvulnerability
CVE-2026-47077
8.2 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-05-25
- Last modified
- 2026-07-24
- Assigner
- 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
- CVSS 4.0 (6b3ad84c-e1a6-4bf7-a703-f496b71e49db)
- 8.2 HIGH — 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
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-400
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.
Affected configurations
• benoitc hackney (>= 2.0.0 < 4.0.1)
Related
Weakness · CWE (1)
- CWE-400 Uncontrolled Resource Consumption weakness
References
- https://cna.erlef.org/cves/CVE-2026-47077.html Patch, Third Party Advisory
- https://github.com/benoitc/hackney/commit/3d25f9fea26c90609de9d64366fedfe5065413bc Patch
- https://github.com/benoitc/hackney/security/advisories/GHSA-jq4m-q6p2-8gwc Exploit, Patch, Vendor Advisory
- https://osv.dev/vulnerability/EEF-CVE-2026-47077 Patch, Third Party Advisory
- https://github.com/benoitc/hackney/security/advisories/GHSA-jq4m-q6p2-8gwc Exploit, Patch, Vendor Advisory