PT-2026-43068 · Benoitc · Hackney

Benoit Chesneau + 2 · Published 2026-05-25 · Updated 2026-05-25 · CVE-2026-47071

Mitre

CVSS v4.0

8.2

High

Base vector

AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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.

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

CVE-2026-47071

Affected Products

Hackney

References · 4

• https://github.com/benoitc/hackney/commit/5ccdab725c561a6f03d05a51f2d0664f98236dae · Patch
• https://github.com/benoitc/hackney/security/advisories/GHSA-gp9c-pm5m-5cxr · Vendor Advisory
• https://osv.dev/vulnerability/EEF-CVE-2026-47071 · Note
• https://cna.erlef.org/cves/CVE-2026-47071.html · Note