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CVE-2026-6550

Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python

Published: Apr 20, 2026Updated: Apr 20, 2026 Sources: CVE List
NVD MITRE
4.7CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:LAC:HPR:LUI:NS:UC:NI:HA:N
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None

Weaknesses

CWE-757CWE-757 Selection of Less-Secure algorithm during negotiation ('algorithm downgrade')

Affected Products

AWS Encryption SDK for Python
AWS

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://aws.amazon.com/security/security-bulletins/2026-017-aws/
aws.amazon.com
https://github.com/aws/aws-encryption-sdk-python/releases/tag/v4.0.5
github.com
https://github.com/aws/aws-encryption-sdk-python/releases/tag/v3.3.1
github.com
and 1 more references View all →

Timeline

Published
Apr 20, 2026
Last Updated
Apr 20, 2026

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