---
cve: "CVE-2026-47071"
severity: "HIGH"
cvss: 8.2
epss: "75%"
vendor: "benoitc"
kev: false
exploited: false
published: "2026-05-25 15:16:22"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-16T02:13:31+02:00"
---

# CVE-2026-47071

> 8.2 HIGH · 🧪 PoC

## Beschreibung

Uncontrolled Resource Consumption vulnerability in benoitc hackney allows Flooding. The SOCKS5 transport in src/hackney_socks5.erl correctly applies the caller-supplied timeout to the SOCKS5 negotiation phase, but then upgrades the connection to TLS using the two-argument form ssl:connect/2, which defaults to an infinite timeout. The Timeout value is in scope at the call site but is not forwarded. A hostile SOCKS5 proxy that completes the SOCKS5 handshake normally and then goes silent (or sends a partial TLS ServerHello and stalls) will cause the connecting process to block indefinitely, regardless of the connect_timeout or recv_timeout options supplied by the caller.

This issue affects hackney: from 0.10.0 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)
- 5ccdab725c561a6f03d05a51f2d0664f98236dae (Commit)

## Referenzen

- <https://github.com/benoitc/hackney/security/advisories/GHSA-gp9c-pm5m-5cxr>
- <https://cna.erlef.org/cves/CVE-2026-47071.html>
- <https://osv.dev/vulnerability/EEF-CVE-2026-47071>
- <https://github.com/benoitc/hackney/commit/5ccdab725c561a6f03d05a51f2d0664f98236dae>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-47071) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_