Skip to content
CVE PROGRAM SOURCE RECORD8.2 High

CVE-2026-47071

SOCKS5 TLS upgrade ignores caller timeout in hackney

Description

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

benoitc hackney

Default version status: unaffected

  • 0.10.0 to < 4.0.1affected
pkg:hex/hackney

benoitc hackney

Default version status: unaffected

  • 34cdbd1d20a282aacc286a89327465a3925b4c5d to < 5ccdab725c561a6f03d05a51f2d0664f98236daeaffected
pkg:github/benoitc/hackney

References