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TI-2026-34676 Aliases CVE-2026-47074GHSA-8jgf-23q5-x7xx

ex_aws_sns SigningCertURL not validated in verify_message/1

Priority MEDIUM 43CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Spoofing
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-295.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00226 13th percentileScored 2026-11-07
Fix Fixed ex_aws_sns (ex-aws): 2.3.5ex_aws_sns (Hex): 2.3.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ex-awsex_aws_sns2.0.1 to before 2.3.52.3.5Patch availableCNA
—ex_aws_sns (Hex)2.0.1 to before 2.3.52.3.5Patch availableGHSA-8jgf-23q5-x7xx
  • ex_aws_sns Vendorex-aws Affected 2.0.1 to before 2.3.5 Fixed in 2.3.5 Patch available CNA
  • ex_aws_sns (Hex) Vendor— Affected 2.0.1 to before 2.3.5 Fixed in 2.3.5 Patch available GHSA-8jgf-23q5-x7xx

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:ex_aws_sns_project:ex_aws_sns:*:*:*:*:*:*:*:*———
  • cpe:2.3:a:ex_aws_sns_project:ex_aws_sns:*:*:*:*:*:*:*:* Versions — — ·—

Remediation

  • Fix · CNA ex_aws_sns (ex-aws) Fixed in 2.3.5
  • Fix · GHSA-8jgf-23q5-x7xx ex_aws_sns (Hex) Fixed in 2.3.5 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-47074
  2. 2026-10-03 Alias added: GHSA-8jgf-23q5-x7xx

References

Patch 1

Advisory 2

Other 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences