{"id":"CVE-2026-47067","aliases":["EEF-CVE-2026-47067","GHSA-9653-rcfr-5c62"],"url":"https://o3.security/vulnerability/CVE-2026-47067","summary":"Atom table exhaustion via unrecognized URL schemes in hackney","details":"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.\n\nThis issue affects hackney: from 2.0.0 before 4.0.1.","published":"2026-05-25T14:00:48.507Z","modified":"2026-08-12T03:51:29.072137653Z","cvss":null,"epss":{"score":0.00753,"percentile":0.52749,"asOf":"2026-09-08"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Hex","name":"hackney","fixedVersion":"4.0.1"}],"fix":{"url":"https://github.com/benoitc/hackney/commit/31f6f0e27e096ad88743dfded4f030a3ee74972e","label":"benoitc/hackney@31f6f0e"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-47067.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-47067"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47067.json"},{"type":"ADVISORY","url":"https://github.com/benoitc/hackney/security/advisories/GHSA-9653-rcfr-5c62"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47067"},{"type":"FIX","url":"https://github.com/benoitc/hackney/commit/31f6f0e27e096ad88743dfded4f030a3ee74972e"},{"type":"PACKAGE","url":"https://github.com/benoitc/hackney"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:29.072137653Z"}}