{"id":"CVE-2026-47074","summary":"ex_aws_sns SigningCertURL not validated in verify_message/1","details":"Improper Certificate Validation vulnerability in ex-aws ex_aws_sns (ExAws.SNS, ExAws.SNS.PublicKeyCache modules) allows Signature Spoofing by Improper Validation.\n\nThis vulnerability is associated with program files lib/ex_aws/sns.ex, lib/ex_aws/sns/public_key_cache.ex and program routines 'Elixir.ExAws.SNS':verify_message/1, 'Elixir.ExAws.SNS.PublicKeyCache':get/1.\n\n'Elixir.ExAws.SNS':verify_message/1 fetches the signing certificate from the SigningCertURL field of the incoming SNS message without validating that the URL uses HTTPS or that the host matches an AWS-owned SNS certificate domain. An unauthenticated attacker who can POST to an endpoint that calls verify_message/1 can supply an attacker-controlled SigningCertURL, sign a forged SNS message with their own key, and cause the function to return :ok, completely bypassing SNS signature verification.\n\nThis issue affects ex_aws_sns: from 2.0.1 before 2.3.5.","aliases":["EEF-CVE-2026-47074","GHSA-8jgf-23q5-x7xx"],"modified":"2026-06-18T03:54:29.972300339Z","published":"2026-05-28T09:05:54.815Z","database_specific":{"cwe_ids":["CWE-295"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47074.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"a7ec21880943f4dac1d59bda557db0ffcd2b61fa"},{"fixed":"1853d280b152d10384a1e21a22cf22152a60be48"}]}],"cna_assigner":"EEF"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-47074.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://hex.pm"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-47074"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47074.json"},{"type":"ADVISORY","url":"https://github.com/ex-aws/ex_aws_sns/security/advisories/GHSA-8jgf-23q5-x7xx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47074"},{"type":"FIX","url":"https://github.com/ex-aws/ex_aws_sns/commit/1853d280b152d10384a1e21a22cf22152a60be48"},{"type":"PACKAGE","url":"https://github.com/ex-aws/ex_aws_sns"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ex-aws/ex_aws_sns","events":[{"introduced":"775d31ffb1e78702d78275ad8841be132d678b50"},{"fixed":"97626db164a68b60c87f03fd3238551076b8a9ac"},{"fixed":"1853d280b152d10384a1e21a22cf22152a60be48"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"2.0.1"},{"fixed":"2.3.5"}]}}],"versions":["v2.3.3","v2.3.2","v2.3.1","v2.3.0","v2.2.0","v2.0.1"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-47074.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"}]}