CVE-2026-47076

216.73.216.6

· Published 25/05/2026 15:16 · Modified 26/05/2026 19:58

Labels: CVE-2026-47076 2026-05-25 6b3ad84c-e1a6-4bf7-a703-f496b71e49db CVE-2026-47076 CWE-436

Essential information

Published: 25/05/2026 15:16
Modified: 26/05/2026 19:58
Author: —
Creator: —
CVSS: 6.9 MEDIUM (v3) 6.9 MEDIUM (v4.0)
CISA KEV: No
CWE: —
CVSS vector: —

CVSS metrics

Description

Interpretation Conflict vulnerability in benoitc hackney allows Server Side Request Forgery. hackney_url:normalize/2 URL-decodes the host component after the URL has been parsed into a #hackney_url{} record. OTP's uri_string:parse/1 and inet:parse_address/1 do not decode percent-escapes in the host, so a URL such as http://%31%32%37%2E%30%2E%30%2E%31/ is seen by a caller's allowlist validator with host %31%32%37%2E%30%2E%30%2E%31 (not an IP address), which passes the allowlist check. hackney's normalizer then decodes the host to 127.0.0.1 and opens a TCP connection to loopback. Because hackney:request/5 always calls hackney_url:normalize/2 with no opt-out, every request that takes a binary or list URL is affected. The same technique reaches cloud instance metadata services (169.254.169.254), RFC1918 networks, and any admin interface listening on localhost. This issue affects hackney: from 0.13.0 before 4.0.1.

NVD status

Status: Undergoing Analysis — CVE has been recently published to the CVE List and has been received by the NVD.
Source: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
NVD: View on NVD

Affected products (CPE)

Product	CPE
benoitc / hackney	`cpe:2.3:a:benoitc:hackney:0.13.0-4.0.0:::::::*`