CVE-2026-47076

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Source
https://cve.org/CVERecord?id=CVE-2026-47076
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47076.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-47076
Aliases
Published
2026-05-25T14:00:46Z
Modified
2026-10-21T02:30:30Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N CVSS Calculator
Summary
SSRF allowlist bypass via percent-encoded host in hackney
Details

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.

Database specific 
{
    "cna_assigner":  "EEF",
    "cwe_ids":  [
        "CWE-436",
        "CWE-918"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47076.json"
}
References

Affected packages

Git / github.com/benoitc/hackney

Affected ranges

Type
GIT
Repo
https://github.com/benoitc/hackney
Events
Introduced
fd2158b39b0aa139bb90f0c867f246ddfec072e6
Fixed
c41c8d48ace8141b003f6f1de3ca6734a0c53056
Fixed
452620a92ec1da2e6b4862a049a2a4f04b42068f
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0.13.0"
                },
                {
                    "fixed":  "4.0.1"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "452620a92ec1da2e6b4862a049a2a4f04b42068f"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

0.*
0.13.0
0.13.1
0.14.0
0.14.1
0.14.2
0.14.3
0.15.0
0.15.1
0.15.2
0.16.0
1.*
1.0.0
1.0.1
1.0.2
1.0.3
1.0.4
1.0.5
1.0.6
1.1.0
1.10.0
1.10.1
1.11.0
1.12.0
1.12.1
1.13.0
1.14.0
1.14.2
1.14.3
1.15.0
1.15.1
1.15.2
1.16.0
1.17.0
1.17.1
1.17.2
1.17.3
1.17.4
1.18.0
1.18.1
1.18.2
1.19.0
1.19.1
1.2.0
1.20.0
1.20.1
1.21.0
1.22.0
1.23.0
1.24.0
1.24.1
1.25.0
1.3.0
1.3.1
1.3.2
1.4.0
1.4.1
1.4.10
1.4.2
1.4.3
1.4.4
1.4.5
1.4.6
1.4.7
1.4.8
1.4.9
1.5.0
1.5.1
1.5.4
1.5.5
1.5.6
1.5.7
1.6.0
1.6.1
1.6.2
1.6.3
1.6.4
1.6.5
1.6.6
1.7.0
1.7.1
1.8.0
1.8.2
1.8.3
1.8.4
1.8.5
1.8.6
1.9.0
2.*
2.0.0
2.0.0-beta.1
2.0.1
3.*
3.0.1
3.0.2
3.0.3
3.1.0
3.1.1
3.1.2
3.2.0
3.2.1
4.*
4.0.0
v1.*
v1.17.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47076.json"