PT-2026-33829 · Amazon · Aws Encryption Sdk For Python

1Seal.Org · Published 2026-04-20 · Updated 2026-04-24 · CVE-2026-6550

Positive Technologies (AI Summary)

CVSS v3.1

4.7

Medium

Base vector

AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions Amazon AWS Encryption SDK for Python versions prior to 3.3.1 Amazon AWS Encryption SDK for Python versions prior to 4.0.5

Description A cryptographic algorithm downgrade in the caching layer may allow an authenticated local threat actor to bypass key commitment policy enforcement via a shared key cache. This can result in ciphertext that can be decrypted to multiple different plaintexts.

Recommendations Upgrade to version 3.3.1 or above. Upgrade to version 4.0.5 or above.

Fix

Weakness Enumeration

CWE-757

Related Identifiers

CVE-2026-6550

GHSA-V638-38FC-RHFV

Affected Products

Aws Encryption Sdk For Python

References · 12

• https://github.com/aws/aws-encryption-sdk-python/releases/tag/v4.0.5 · Patch
• https://github.com/aws/aws-encryption-sdk-python/releases/tag/v3.3.1 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-6550 · Security Note
• https://aws.amazon.com/security/security-bulletins/2026-017-aws · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-v638-38fc-rhfv · Vendor Advisory
• https://github.com/google/security-research/security/advisories/GHSA-wqgp-vphw-hphf · Note
• https://github.com/aws/aws-encryption-sdk-python/security/advisories/GHSA-v638-38fc-rhfv · Note
• https://github.com/aws/aws-encryption-sdk-python · Note
• https://twitter.com/eyalestrin/status/2047415278884274461 · Twitter Post
• https://twitter.com/vuldb/status/2046588321141567908 · Twitter Post
• https://twitter.com/dailycve/status/2047726209270726759 · Twitter Post
• https://twitter.com/CVEnew/status/2046571908452553085 · Twitter Post