CVE-2026-47067Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding.
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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
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
benoitc hackney benoitc:hackney | from 2.0.0 before 4.0.1 | NVD |
References
- https://cna.erlef.org/cves/CVE-2026-47067.htmlpatch, third-party-advisory
- https://github.com/benoitc/hackney/commit/31f6f0e27e096ad88743dfded4f030a3ee74972epatch
- https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62exploit, patch, vendor-advisory
- https://osv.dev/vulnerability/EEF-CVE-2026-47067patch, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.