CVE-2026-47067

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.

• CWE-770

• 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
• https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62Exploit, Patch, Vendor Advisory

Published

May 25, 2026

Last Modified

Jul 24, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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