Allocation of Resources Without Limits or Throttling Affecting hackney package, versions >=2.0.0 <4.0.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published26 May 2026
- disclosed25 May 2026
- creditPJUllrich
Introduced: 25 May 2026
NewCVE-2026-47067 (opens in a new tab)How to fix?
Upgrade hackney to version 4.0.1 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through the parse_url/1 scheme parsing path in hackney_url. An attacker can drive the BEAM atom table toward system_limit by supplying URLs with many unique scheme prefixes, such as direct request targets, webhook URLs, or redirect Location headers that hackney parses. Each distinct scheme is turned into a permanent atom during URL parsing, exhausting the runtime’s atom table and causing service disruption for applications that process attacker-controlled URLs.