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:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| benoitc | hackney | >= 0.10.0, < 4.0.1 |
| benoitc | hackney | >= 34cdbd1d20a282aacc286a89327465a3925b4c5d, < 5ccdab725c561a6f03d05a51f2d0664f98236dae |
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
- Jul 24, 2026
- NVD status
- Analyzed