CVE-2026-47071: Benoitc Hackney

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Uncontrolled Resource Consumption vulnerability in benoitc hackney allows Flooding. The SOCKS5 transport in src/hackney_socks5.erl correctly applies the caller-supplied timeout to the SOCKS5 negotiation phase, but then upgrades the connection to TLS using the two-argument form ssl:connect/2, which defaults to an infinite timeout. The Timeout value is in scope at the call site but is not forwarded. A hostile SOCKS5 proxy that completes the SOCKS5 handshake normally and then goes silent (or sends a partial TLS ServerHello and stalls) will cause the connecting process to block indefinitely, regardless of the connect_timeout or recv_timeout options supplied by the caller. This issue affects hackney: from 0.10.0 before 4.0.1.

Affected products

• Benoitc Hackney: from 0.10.0, before 4.0.1 (fixed in 4.0.1)

Published 2026-05-25. Last modified 2026-07-24.