{"id":"CVE-2026-47074","state":"PUBLISHED","title":"ex_aws_sns SigningCertURL not validated in verify_message/1","description":"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.","publishedAt":"2026-05-28T09:05:54.815Z","updatedAt":"2026-05-29T04:40:43.232Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"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","source":"EEF"},"assigner":"EEF","products":["ex-aws ex_aws_sns"],"affected":[{"vendor":"ex-aws","product":"ex_aws_sns","packageName":"ex_aws_sns","packageURL":"pkg:hex/ex_aws_sns","defaultStatus":"unaffected","versions":[{"version":"2.0.1","status":"affected","lessThan":"2.3.5","versionType":"semver"}],"collectionURL":"https://hex.pm","cpes":["cpe:2.3:a:ex_aws_sns_project:ex_aws_sns:*:*:*:*:*:*:*:*"],"modules":["'Elixir.ExAws.SNS'","'Elixir.ExAws.SNS.PublicKeyCache'"],"programFiles":["lib/ex_aws/sns.ex","lib/ex_aws/sns/public_key_cache.ex"],"programRoutines":[{"name":"'Elixir.ExAws.SNS':verify_message/1"},{"name":"'Elixir.ExAws.SNS.PublicKeyCache':get/1"}],"repo":"https://github.com/ex-aws/ex_aws_sns"},{"vendor":"ex-aws","product":"ex_aws_sns","packageName":"ex-aws/ex_aws_sns","packageURL":"pkg:github/ex-aws/ex_aws_sns","defaultStatus":"unaffected","versions":[{"version":"a7ec21880943f4dac1d59bda557db0ffcd2b61fa","status":"affected","lessThan":"1853d280b152d10384a1e21a22cf22152a60be48","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ex_aws_sns_project:ex_aws_sns:*:*:*:*:*:*:*:*"],"modules":["'Elixir.ExAws.SNS'","'Elixir.ExAws.SNS.PublicKeyCache'"],"programFiles":["lib/ex_aws/sns.ex","lib/ex_aws/sns/public_key_cache.ex"],"programRoutines":[{"name":"'Elixir.ExAws.SNS':verify_message/1"},{"name":"'Elixir.ExAws.SNS.PublicKeyCache':get/1"}],"repo":"https://github.com/ex-aws/ex_aws_sns"}],"references":["https://github.com/ex-aws/ex_aws_sns/security/advisories/GHSA-8jgf-23q5-x7xx","https://cna.erlef.org/cves/CVE-2026-47074.html","https://osv.dev/vulnerability/EEF-CVE-2026-47074","https://github.com/ex-aws/ex_aws_sns/commit/1853d280b152d10384a1e21a22cf22152a60be48"],"weaknesses":["CWE-295"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/47xxx/CVE-2026-47074.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-47074","state":"PUBLISHED","datePublished":"2026-05-28T09:05:54.815Z","dateUpdated":"2026-05-29T04:40:43.232Z","assignerShortName":"EEF","assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateReserved":"2026-05-18T17:28:08.322Z"},"containers":{"cna":{"title":"ex_aws_sns SigningCertURL not validated in verify_message/1","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"ex-aws","product":"ex_aws_sns","packageName":"ex_aws_sns","packageURL":"pkg:hex/ex_aws_sns","defaultStatus":"unaffected","versions":[{"version":"2.0.1","status":"affected","lessThan":"2.3.5","versionType":"semver"}],"collectionURL":"https://hex.pm","cpes":["cpe:2.3:a:ex_aws_sns_project:ex_aws_sns:*:*:*:*:*:*:*:*"],"modules":["'Elixir.ExAws.SNS'","'Elixir.ExAws.SNS.PublicKeyCache'"],"programFiles":["lib/ex_aws/sns.ex","lib/ex_aws/sns/public_key_cache.ex"],"programRoutines":[{"name":"'Elixir.ExAws.SNS':verify_message/1"},{"name":"'Elixir.ExAws.SNS.PublicKeyCache':get/1"}],"repo":"https://github.com/ex-aws/ex_aws_sns"},{"vendor":"ex-aws","product":"ex_aws_sns","packageName":"ex-aws/ex_aws_sns","packageURL":"pkg:github/ex-aws/ex_aws_sns","defaultStatus":"unaffected","versions":[{"version":"a7ec21880943f4dac1d59bda557db0ffcd2b61fa","status":"affected","lessThan":"1853d280b152d10384a1e21a22cf22152a60be48","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ex_aws_sns_project:ex_aws_sns:*:*:*:*:*:*:*:*"],"modules":["'Elixir.ExAws.SNS'","'Elixir.ExAws.SNS.PublicKeyCache'"],"programFiles":["lib/ex_aws/sns.ex","lib/ex_aws/sns/public_key_cache.ex"],"programRoutines":[{"name":"'Elixir.ExAws.SNS':verify_message/1"},{"name":"'Elixir.ExAws.SNS.PublicKeyCache':get/1"}],"repo":"https://github.com/ex-aws/ex_aws_sns"}],"references":[{"url":"https://github.com/ex-aws/ex_aws_sns/security/advisories/GHSA-8jgf-23q5-x7xx","tags":["vendor-advisory","related"]},{"url":"https://cna.erlef.org/cves/CVE-2026-47074.html","tags":["related"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-47074","tags":["related"]},{"url":"https://github.com/ex-aws/ex_aws_sns/commit/1853d280b152d10384a1e21a22cf22152a60be48","tags":["patch"]}],"metrics":[{"cvssV4_0":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-295","description":"CWE-295 Improper Certificate Validation","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"EEF","orgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateUpdated":"2026-05-29T04:40:43.232Z"},"configurations":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>The application must expose an HTTP endpoint that calls <tt>'Elixir.ExAws.SNS':verify_message/1</tt> on incoming request bodies.</p>"}],"value":"The application must expose an HTTP endpoint that calls 'Elixir.ExAws.SNS':verify_message/1 on incoming request bodies."}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:ex_aws_sns_project:ex_aws_sns:*:*:*:*:*:*:*:*","versionEndExcluding":"2.3.5","versionStartIncluding":"2.0.1","vulnerable":true}],"negate":false,"operator":"AND"}],"operator":"OR"}],"credits":[{"lang":"en","type":"finder","value":"Peter Ullrich"},{"lang":"en","type":"remediation developer","value":"Bernard Duggan"},{"lang":"en","type":"remediation developer","value":"Jonatan Männchen / EEF"},{"lang":"en","type":"analyst","value":"Jonatan Männchen / EEF"}],"impacts":[{"capecId":"CAPEC-473","descriptions":[{"lang":"en","value":"CAPEC-473 Signature Spoofing by Improper Validation"}]}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-28T10:29:45.193313Z","id":"CVE-2026-47074","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-28T10:31:15.111Z"}}]}}}