---
cve: "CVE-2026-47067"
severity: "HIGH"
cvss: 8.7
epss: "75%"
vendor: "benoitc"
kev: false
exploited: false
published: "2026-05-25 15:16:21"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T11:27:27+02:00"
---

# CVE-2026-47067

> 8.7 HIGH · 🧪 PoC

## Beschreibung

Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. The URL parser in src/hackney_url.erl converts every unrecognized URL scheme to a permanent BEAM atom via binary_to_atom/2. BEAM atoms are never garbage-collected and the atom table defaults to a hard limit of 1,048,576 entries. An attacker who can supply URLs with attacker-chosen scheme prefixes — directly as request targets, as configured webhook URLs, or via Location headers followed during redirects — can exhaust the atom table and crash the entire BEAM VM with system_limit.

This issue affects hackney: from 2.0.0 before 4.0.1.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/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)
- 31f6f0e27e096ad88743dfded4f030a3ee74972e (Commit)

## Referenzen

- <https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62>
- <https://cna.erlef.org/cves/CVE-2026-47067.html>
- <https://osv.dev/vulnerability/EEF-CVE-2026-47067>
- <https://github.com/benoitc/hackney/commit/31f6f0e27e096ad88743dfded4f030a3ee74972e>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-47067) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_