CVE-2026-47074
Description
Improper Certificate Validation vulnerability in ex-aws ex_aws_sns (ExAws.SNS, ExAws.SNS.PublicKeyCache modules) allows Signature Spoofing by Improper Validation.
This 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.
'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.
This issue affects ex_aws_sns: from 2.0.1 before 2.3.5.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
ex_aws_snsHex | >= 2.0.1, < 2.3.5 | 2.3.5 |
Affected products
2(expand)+ 1 more
- (no CPE)
- (no CPE)range: from 2.0.1 before 2.3.5
Patches
Vulnerability mechanics
References
7- github.com/advisories/GHSA-8jgf-23q5-x7xxghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-47074ghsaADVISORY
- github.com/benoitc/hackney/security/advisories/GHSA-jq4m-q6p2-8gwcghsaWEB
- github.com/ex-aws/ex_aws_sns/commit/1853d280b152d10384a1e21a22cf22152a60be48nvdWEB
- github.com/ex-aws/ex_aws_sns/security/advisories/GHSA-8jgf-23q5-x7xxnvdWEB
- osv.dev/vulnerability/EEF-CVE-2026-47074nvdWEB
- cna.erlef.org/cves/CVE-2026-47074.htmlnvd
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