CVE-2026-47077 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-47077HIGH

benoitc hackney — Unbounded body accumulation in HTTP/3 response loop in hackney

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   P   N   N   N   N   H    8.2   .0070   50.5     —

AFFECTED
  Product  Versions                                    Fixed
  hackney  2.0.0 –                                     —
  hackney  0334af206d5099fdf510ed9eda18e34396f065ad –  —

TIMELINE
  May 18  Reserved by EEF
  May 25  EXPLOIT PUBLISHED — CVE-2026-47077 (benoitc hackney). Public exploit reference added.
  May 25  Published (CNA: EEF)

CWE-400 · CNA: EEF · CVSS v4.0 · 4 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 18, 2026	Reserved	Reserved by EEF
May 25, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-47077 (benoitc hackney). Public exploit reference added.
May 25, 2026	Published	Published (CNA: EEF)

Affected

Affected products and packages — 2 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
benoitc	hackney	—	2.0.0	—
benoitc	hackney	—	0334af206d5099fdf510ed9eda18e34396f065ad	—

Weaknesses

CWE-400

References (4)

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]

Authoritative record: CVE-2026-47077 at cve.org

Vendors: benoitc

Weaknesses: CWE-400

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-47077 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.