Medium severity4.7NVD Advisory· Published Apr 20, 2026· Updated Apr 21, 2026
CVE-2026-6550
CVE-2026-6550
Description
Cryptographic algorithm downgrade in the caching layer of Amazon AWS Encryption SDK for Python before version 3.3.1 and before version 4.0.5 might allow an authenticated local threat actor to bypass key commitment policy enforcement via a shared key cache, resulting in ciphertext that can be decrypted to multiple different plaintexts.
To remediate this issue, users should upgrade to version 3.3.1, 4.0.5 or above.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
aws-encryption-sdkPyPI | >= 2.0.0, < 3.3.1 | 3.3.1 |
aws-encryption-sdkPyPI | >= 4.0.0, < 4.0.5 | 4.0.5 |
Affected products
2Patches
Vulnerability mechanics
References
8- github.com/advisories/GHSA-v638-38fc-rhfvghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-6550ghsaADVISORY
- aws.amazon.com/security/security-bulletins/2026-017-awsghsaWEB
- github.com/aws/aws-encryption-sdk-python/releases/tag/v3.3.1nvdWEB
- github.com/aws/aws-encryption-sdk-python/releases/tag/v4.0.5nvdWEB
- github.com/aws/aws-encryption-sdk-python/security/advisories/GHSA-v638-38fc-rhfvnvdWEB
- github.com/google/security-research/security/advisories/GHSA-wqgp-vphw-hphfghsaWEB
- aws.amazon.com/security/security-bulletins/2026-017-aws/nvd
News mentions
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