CVEvulnerability
CVE-2026-47067
8.7 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-05-25
- Last modified
- 2026-07-24
- Assigner
- 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
- CVSS 4.0 (6b3ad84c-e1a6-4bf7-a703-f496b71e49db)
- 8.7 HIGH — 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-770
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.
Affected configurations
• benoitc hackney (>= 2.0.0 < 4.0.1)
Related
Weakness · CWE (1)
- CWE-770 Allocation of Resources Without Limits or Throttling weakness
References
- https://cna.erlef.org/cves/CVE-2026-47067.html Patch, Third Party Advisory
- https://github.com/benoitc/hackney/commit/31f6f0e27e096ad88743dfded4f030a3ee74972e Patch
- https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62 Exploit, Patch, Vendor Advisory
- https://osv.dev/vulnerability/EEF-CVE-2026-47067 Patch, Third Party Advisory
- https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62 Exploit, Patch, Vendor Advisory