PT-2026-44365 · Ex Aws · Ex Aws Sns

Bernard Duggan + 1 · Published 2026-05-28 · Updated 2026-05-28 · CVE-2026-47074

NVD

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Fix

Improper Certificate Validation

Weakness Enumeration

CWE-295

Related Identifiers

CVE-2026-47074

Affected Products

Ex Aws Sns

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-47074 · Security Note
• https://github.com/ex-aws/ex_aws_sns/commit/1853d280b152d10384a1e21a22cf22152a60be48 · Patch
• https://github.com/ex-aws/ex_aws_sns/security/advisories/GHSA-8jgf-23q5-x7xx · Vendor Advisory
• https://cna.erlef.org/cves/CVE-2026-47074.html · Note
• https://osv.dev/vulnerability/EEF-CVE-2026-47074 · Note