high7.5
CVE-2026-47067
Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding.
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| erlang | hackney | >= 2.0.0, < 4.0.1 | 4.0.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Benoitc | Hackney | from 2.0.0 before 4.0.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-9653-rcfr-5c62
- https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62
- https://nvd.nist.gov/vuln/detail/CVE-2026-47067
- https://github.com/benoitc/hackney/commit/31f6f0e27e096ad88743dfded4f030a3ee74972e
- https://cna.erlef.org/cves/CVE-2026-47067.html
- https://osv.dev/vulnerability/EEF-CVE-2026-47067