← Back to CVEs

CVE-2026-6550

MEDIUM

4.7

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.

CVE Details

CVSS v3.1 Score4.7

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack VectorLOCAL

ComplexityHIGH

Privileges RequiredLOW

User InteractionNONE

Published4/20/2026

Last Modified4/21/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-757

References

https://aws.amazon.com/security/security-bulletins/2026-017-aws/(ff89ba41-3aa1-4d27-914a-91399e9639e5)

https://github.com/aws/aws-encryption-sdk-python/releases/tag/v3.3.1(ff89ba41-3aa1-4d27-914a-91399e9639e5)

https://github.com/aws/aws-encryption-sdk-python/releases/tag/v4.0.5(ff89ba41-3aa1-4d27-914a-91399e9639e5)

https://github.com/aws/aws-encryption-sdk-python/security/advisories/GHSA-v638-38fc-rhfv(ff89ba41-3aa1-4d27-914a-91399e9639e5)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.