Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Benoitc | Hackney | >= 2.0.0, < 4.0.1 |
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-47067.htmlPatchThird Party Advisory
- https://github.com/benoitc/hackney/commit/31f6f0e27e096ad88743dfded4f030a3ee7497Patch
- https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62ExploitPatchVendor Advisory
- https://osv.dev/vulnerability/EEF-CVE-2026-47067PatchThird Party Advisory
- https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62ExploitPatchVendor Advisory
FAQ
What is CVE-2026-47067?
CVE-2026-47067 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2026-47067?
CVE-2026-47067 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-47067?
Check the references section above for vendor advisories and patch information. Affected products include: Benoitc Hackney.