{"id":"CVE-2026-115700","revision":"32862795bb5b448fa921794c1c8b0647","records":[{"revision":"32862795bb5b448fa921794c1c8b0647","observedAt":"2026-10-26T15:35:30.984+00:00","statement":{"source":"cve-program","id":"CVE-2026-115700","aliases":[],"title":"SSRF allowlist bypass via percent-encoded bracketed IPv6 or trailing-dot IP literal in hackney","description":"Interpretation Conflict vulnerability in hackney_url in benoitc hackney allows Server Side Request Forgery via a percent-encoded bracketed IPv6 literal or an IP literal with a trailing dot. A host such as %5B%3A%3Affff%3A127%2E0%2E0%2E1%5D (decoding to [::ffff:127.0.0.1]) or 127.0.0.1. is not an IP address to a caller's allowlist built on uri_string:parse/1 and inet:parse_address/1, while hackney connects to the address it denotes. The same applies to a Location target when redirects are followed.\n\nThe IP-literal gate that hackney_url:normalize/2 applies to a percent-decoded host, added to close the percent-encoded IP bypass of CVE-2026-47076, passes the decoded value to inet_parse:address/1 as is. The connect path in hackney_happy:parse_address/1 drops a surrounding bracket pair, and the resolver ignores a trailing dot, so both forms pass the gate and still reach the literal address. Domain names with a trailing dot and unencoded IPv6 literals are not affected.\n\nThis issue affects hackney: from 4.0.1 before 4.9.0.","state":0,"publishedAt":"2026-10-26T13:49:02.744+00:00","modifiedAt":"2026-10-26T13:49:02.744+00:00","affected":[{"ecosystem":"https://repo.hex.pm","name":"hackney","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://repo.hex.pm\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"hackney_url\"\n                    ],\n                    \"packageName\": \"hackney\",\n                    \"packageURL\": \"pkg:hex/hackney\",\n                    \"product\": \"hackney\",\n                    \"programFiles\": [\n                        \"src/hackney_url.erl\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"hackney_url:normalize/2\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/benoitc/hackney\",\n                    \"vendor\": \"benoitc\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"4.9.0\",\n                            \"status\": \"affected\",\n                            \"version\": \"4.0.1\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"https://github.com","name":"benoitc/hackney","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://github.com\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"hackney_url\"\n                    ],\n                    \"packageName\": \"benoitc/hackney\",\n                    \"packageURL\": \"pkg:github/benoitc/hackney\",\n                    \"product\": \"hackney\",\n                    \"programFiles\": [\n                        \"src/hackney_url.erl\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"hackney_url:normalize/2\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/benoitc/hackney\",\n                    \"vendor\": \"benoitc\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"f19561a0b422376348c91537e51377ab7325f4ee\",\n                            \"status\": \"affected\",\n                            \"version\": \"452620a92ec1da2e6b4862a049a2a4f04b42068f\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":6.9,"severity":"MEDIUM"}],"references":["https://github.com/benoitc/hackney/releases/tag/4.9.0","https://cna.erlef.org/cves/CVE-2026-115700.html","https://osv.dev/vulnerability/EEF-CVE-2026-115700","https://github.com/benoitc/hackney/pull/987","https://github.com/benoitc/hackney/commit/452620a92ec1da2e6b4862a049a2a4f04b42068f","https://github.com/benoitc/hackney/commit/f19561a0b422376348c91537e51377ab7325f4ee"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115700","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-115700","identifiers":["CVE-2026-115700"]},"retained":false,"historicalAffected":[]}],"coverage":[]}