{"containers":{"cna":{"affected":[{"collectionURL":"https://hex.pm","cpes":["cpe:2.3:a:ex_aws_sns_project:ex_aws_sns:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.ExAws.SNS'","'Elixir.ExAws.SNS.PublicKeyCache'"],"packageName":"ex_aws_sns","packageURL":"pkg:hex/ex_aws_sns","product":"ex_aws_sns","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","versions":[{"lessThan":"2.3.5","status":"affected","version":"2.0.1","versionType":"semver"}]},{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ex_aws_sns_project:ex_aws_sns:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.ExAws.SNS'","'Elixir.ExAws.SNS.PublicKeyCache'"],"packageName":"ex-aws/ex_aws_sns","packageURL":"pkg:github/ex-aws/ex_aws_sns","product":"ex_aws_sns","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","versions":[{"lessThan":"1853d280b152d10384a1e21a22cf22152a60be48","status":"affected","version":"a7ec21880943f4dac1d59bda557db0ffcd2b61fa","versionType":"git"}]}],"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"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Improper Certificate Validation vulnerability in ex-aws ex_aws_sns (<tt>ExAws.SNS</tt>, <tt>ExAws.SNS.PublicKeyCache</tt> modules) allows Signature Spoofing by Improper Validation.<p>This vulnerability is associated with program files <tt>lib/ex_aws/sns.ex</tt>, <tt>lib/ex_aws/sns/public_key_cache.ex</tt> and program routines <tt>'Elixir.ExAws.SNS':verify_message/1</tt>, <tt>'Elixir.ExAws.SNS.PublicKeyCache':get/1</tt>.</p><p><tt>'Elixir.ExAws.SNS':verify_message/1</tt> fetches the signing certificate from the <tt>SigningCertURL</tt> 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 <tt>verify_message/1</tt> can supply an attacker-controlled <tt>SigningCertURL</tt>, sign a forged SNS message with their own key, and cause the function to return <tt>:ok</tt>, completely bypassing SNS signature verification.</p><p>This issue affects ex_aws_sns: from 2.0.1 before 2.3.5.</p>"}],"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."}],"impacts":[{"capecId":"CAPEC-473","descriptions":[{"lang":"en","value":"CAPEC-473 Signature Spoofing by Improper Validation"}]}],"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":{"dateUpdated":"2026-05-28T09:05:54.815Z","orgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","shortName":"EEF"},"references":[{"tags":["vendor-advisory","related"],"url":"https://github.com/ex-aws/ex_aws_sns/security/advisories/GHSA-8jgf-23q5-x7xx"},{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-47074.html"},{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-47074"},{"tags":["patch"],"url":"https://github.com/ex-aws/ex_aws_sns/commit/1853d280b152d10384a1e21a22cf22152a60be48"}],"source":{"discovery":"EXTERNAL"},"title":"ex_aws_sns SigningCertURL not validated in verify_message/1","x_generator":{"engine":"cvelib 1.8.0"}}},"cveMetadata":{"assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","assignerShortName":"EEF","cveId":"CVE-2026-47074","datePublished":"2026-05-28T09:05:54.815Z","dateReserved":"2026-05-18T17:28:08.322Z","dateUpdated":"2026-05-28T09:05:54.815Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"}