---
cve: "CVE-2026-47077"
severity: "HIGH"
cvss: 8.2
epss: "70%"
vendor: "benoitc"
kev: false
exploited: false
published: "2026-05-25 15:16:22"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-14T02:23:44+02:00"
---

# CVE-2026-47077

> 8.2 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- c41c8d48ace8141b003f6f1de3ca6734a0c53056 (Commit)
- 3d25f9fea26c90609de9d64366fedfe5065413bc (Commit)

## Referenzen

- <https://github.com/benoitc/hackney/security/advisories/GHSA-jq4m-q6p2-8gwc>
- <https://cna.erlef.org/cves/CVE-2026-47077.html>
- <https://osv.dev/vulnerability/EEF-CVE-2026-47077>
- <https://github.com/benoitc/hackney/commit/3d25f9fea26c90609de9d64366fedfe5065413bc>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-47077) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_