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CVE-2026-47071— SOCKS5 TLS upgrade ignores caller timeout in hackney

Quick assessment

Affected
benoitc hackney
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hackney是Hackney公司的一个程序库。 hackney 0.10.0至4.0.1之前版本存在安全漏洞，该漏洞源于SOCKS5传输在TLS升级时使用无限超时，可能导致连接进程无限阻塞。

AI Predicted 5.9 Difficulty: Easy EPSS 0.70% · P51

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
benoitc hackney 0.10.0< 4.0.1 affected
34cdbd1d20a282aacc286a89327465a3925b4c5d< 5ccdab725c561a6f03d05a51f2d0664f98236dae affected
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I. Basic Information for CVE-2026-47071

Vulnerability Information
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Vulnerability Title
SOCKS5 TLS upgrade ignores caller timeout in hackney
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Hackney 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hackney是Hackney公司的一个程序库。 hackney 0.10.0至4.0.1之前版本存在安全漏洞，该漏洞源于SOCKS5传输在TLS升级时使用无限超时，可能导致连接进程无限阻塞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
benoitc hackney 0.10.0 ~ 4.0.1 cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*
benoitc hackney 34cdbd1d20a282aacc286a89327465a3925b4c5d ~ 5ccdab725c561a6f03d05a51f2d0664f98236dae cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-47071

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-47071

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Patches & Fixes for CVE-2026-47071 (1)

Vendor Advisories for CVE-2026-47071 (3)

Same Patch Batch · benoitc · 2026-05-25 · 10 CVEs total

CVE-2026-47075 6.8 MEDIUM CR/LF injection in query parameter in hackney
CVE-2026-47070 HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect ta
CVE-2026-47069 CRLF injection in cookie domain/path options in hackney
CVE-2026-47076 SSRF allowlist bypass via percent-encoded host in hackney
CVE-2026-47073 Unbounded memory consumption in WebSocket client in hackney
CVE-2026-47072 CRLF injection in WebSocket upgrade request in hackney
CVE-2026-47077 Unbounded body accumulation in HTTP/3 response loop in hackney
CVE-2026-47067 Atom table exhaustion via unrecognized URL schemes in hackney
CVE-2026-47066 Infinite loop in Alt-Svc header parser in hackney

IV. Related Vulnerabilities

Same product: hackney
Same vendor: benoitc
Same weakness: CWE-400

V. Comments for CVE-2026-47071

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