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CVE-2026-47074— ex_aws_sns SigningCertURL not validated in verify_message/1

Quick assessment

Affected
ex-aws ex_aws_sns
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ExAws.SNS是ex-aws开源的一款AWS SNS消息推送服务模块。 ExAws.SNS 2.0.1版本至2.3.5之前版本存在安全漏洞，该漏洞源于证书验证不当，可能导致签名伪造。

AI Predicted 9.8 Difficulty: Easy EPSS 0.23% · P13

Affected Version Matrix 2

VendorProduct Version RangeStatus
ex-aws ex_aws_sns 2.0.1< 2.3.5 affected
a7ec21880943f4dac1d59bda557db0ffcd2b61fa< 1853d280b152d10384a1e21a22cf22152a60be48 affected
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I. Basic Information for CVE-2026-47074

Vulnerability Information
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Vulnerability Title
ex_aws_sns SigningCertURL not validated in verify_message/1
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
ExAws.SNS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ExAws.SNS是ex-aws开源的一款AWS SNS消息推送服务模块。 ExAws.SNS 2.0.1版本至2.3.5之前版本存在安全漏洞，该漏洞源于证书验证不当，可能导致签名伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ex-aws ex_aws_sns 2.0.1 ~ 2.3.5 cpe:2.3:a:ex_aws_sns_project:ex_aws_sns:*:*:*:*:*:*:*:*
ex-aws ex_aws_sns a7ec21880943f4dac1d59bda557db0ffcd2b61fa ~ 1853d280b152d10384a1e21a22cf22152a60be48 cpe:2.3:a:ex_aws_sns_project:ex_aws_sns:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-47074

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III. Intelligence Information for CVE-2026-47074

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Vendor Advisories for CVE-2026-47074 (2)

Other References for CVE-2026-47074 (1)

IV. Related Vulnerabilities

Same weakness: CWE-295