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CVE-2026-47071

30
FAUCET Score

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.

First published: May 25, 2026Last modified: May 25, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.10.0, < 4.0.1CPE matchmatch criteria
cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

8.2HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.75%
Probability of exploitation in next 30 days
EPSS Percentile
51.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0075 is in the 27th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

erlangpatch availablevia ghsa
Product: hackneyFixed in: 4.0.1
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

erlangGHSA-gp9c-pm5m-5cxrhigh

Hackney: `ssl:connect/2` post-handshake upgrade has no timeout

Jun 26, 2026

References

cna.erlef.org / cves/CVE-2026-47071.html
PatchThird Party Advisory
github.com / benoitc/hackney/commit/5ccdab725c561a6f03d05a51f2d0664f98236dae
Patch
github.com / benoitc/hackney/security/advisories/GHSA-gp9c-pm5m-5cxr
ExploitPatchVendor Advisory
osv.dev / vulnerability/EEF-CVE-2026-47071
PatchThird Party Advisory