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Advisory record · GHSA-4v42-65r3-3gjx

Amazon S3 Encryption Client for .NET has a Key Commitment Issue

CVSS 6.0 MediumEPSS 0.0011 · 1st percentile

Published by the GitHub Advisory Database at 18 Dec 2025, 15:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
Amazon.Extensions.S3.EncryptionNuGet<3.2.03.2.0
Identifiers
GHSA-4v42-65r3-3gjx · CVE-2025-14759
Weakness (CWE)
CWE-327
Tags
Published
18 Dec 2025
Updated
18 Dec 2025

Machine-written summary

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

Amazon.Extensions.S3.Encryption versions before 3.2.0 are affected when encrypted data keys are stored in Instruction Files. An attacker who can create a rogue encrypted data key and upload a replacement Instruction File to the S3 bucket could cause the client to decrypt the object into attacker-chosen plaintext. Upgrade to version 3.2.0 or later; the source recommends version 4.0.0 or later for maximum safety.

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
6.0 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CNA (AMZN)
  • CISA KEV Not listed.
  • EPSS 0.0011, the 1st 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.