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Advisory record · GHSA-9cvc-h2w8-phrp

AWS SDK for .NET V4 adopted defense in depth enhancement for region parameter value

CVSS 3.7 LowEPSS 0.0024 · 15th percentile

Published by the GitHub Advisory Database at 9 Jan 2026, 18:56 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
AWSSDK.CoreNuGet>=4.0.0, <4.0.3.34.0.3.3
Identifiers
GHSA-9cvc-h2w8-phrp · CVE-2026-22611
Weakness (CWE)
CWE-20
Tags
Published
9 Jan 2026
Updated
3 Feb 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

AWSSDK.Core versions 4.0.0 before 4.0.3.3 (AWS SDK for .NET v4) accept region values that are not validly formed host labels, which could cause API calls to be routed to non-existent or non-AWS hosts. An actor who can set the region input in the environment where the SDK runs could trigger this. Upgrade to AWSSDK.Core 4.0.3.3 or later, which validates the region format; no other workaround is needed beyond standard input validation and keeping the SDK updated.

Written 9 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
3.7 Low 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0024, the 15th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:22 UTC First seen by agentprime
  2. 31 Oct 2026, 15:22 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.