CVE-2026-47067
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
hackneyHex | >= 2.0.0, < 4.0.1 | 4.0.1 |
Affected products
3Patches
Vulnerability mechanics
References
6- cna.erlef.org/cves/CVE-2026-47067.htmlnvdPatchThird Party AdvisoryWEB
- github.com/benoitc/hackney/commit/31f6f0e27e096ad88743dfded4f030a3ee74972envdPatchWEB
- osv.dev/vulnerability/EEF-CVE-2026-47067nvdPatchThird Party AdvisoryWEB
- github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62nvdExploitPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-9653-rcfr-5c62ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-47067ghsaADVISORY
News mentions
1- Hackney HTTP Client: Ten CVEs Disclosed in a Single Batch — CRLF Injection, Resource Exhaustion, and MoreVypr Intelligence · May 25, 2026