CVE-2026-47071

HIGH

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.

CVSS v3.1 Score

7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Published: 5/25/2026Modified: 5/27/2026

Related Intelligence (1)

HIGHVulnerability

NVD HIGH: CVE-2026-47071 — Uncontrolled Resource Consumption vulnerability in benoitc hackney allows Floodi...

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.

CVE-2026-47071
NIST NVD

References (5)

https://cna.erlef.org/cves/CVE-2026-47071.htmlThird Party AdvisoryPatchhttps://github.com/benoitc/hackney/commit/5ccdab725c561a6f03d05a51f2d0664f98236daePatchhttps://github.com/benoitc/hackney/security/advisories/GHSA-gp9c-pm5m-5cxrExploitPatchhttps://osv.dev/vulnerability/EEF-CVE-2026-47071Third Party AdvisoryPatchhttps://github.com/benoitc/hackney/security/advisories/GHSA-gp9c-pm5m-5cxrExploitPatch