CVE-2026-47071

Name: CVE-2026-47071
Creator: NVD / NIST
Published: 2026-05-25T15:16:22.143+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.2/10EPSS 0.70%

Last modified Jun 17, 2026

CVE-2026-47071 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. 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. EPSS estimates a 0.70% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 4.0

8.2/10

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.70%

48.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Benoitc	Hackney	>= 0.10.0, < 4.0.1

References

https://cna.erlef.org/cves/CVE-2026-47071.htmlPatch, Third Party Advisory
https://github.com/benoitc/hackney/commit/5ccdab725c561a6f03d05a51f2d0664f98236daePatch
https://github.com/benoitc/hackney/security/advisories/GHSA-gp9c-pm5m-5cxrExploit, Patch, Vendor Advisory
https://osv.dev/vulnerability/EEF-CVE-2026-47071Patch, Third Party Advisory
https://github.com/benoitc/hackney/security/advisories/GHSA-gp9c-pm5m-5cxrExploit, Patch, Vendor Advisory

Timeline

Published: May 25, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-47071?

How severe is CVE-2026-47071?

CVE-2026-47071 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.

How do I fix CVE-2026-47071?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-47071?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST