CVE-2020-8897: Amazon Aws Encryption SDK

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

A weak robustness vulnerability exists in the AWS Encryption SDKs for Java, Python, C and Javalcript prior to versions 2.0.0. Due to the non-committing property of AES-GCM (and other AEAD ciphers such as AES-GCM-SIV or (X)ChaCha20Poly1305) used by the SDKs to encrypt messages, an attacker can craft a unique cyphertext which will decrypt to multiple different results, and becomes especially relevant in a multi-recipient setting. We recommend users update their SDK to 2.0.0 or later.

Affected products

• Amazon Aws Encryption SDK: before 2.0.0 (fixed in 2.0.0)

Published 2020-11-16. Last modified 2026-06-17.