CVE-2026-6550
4.7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| AWS | AWS Encryption SDK for Python | 2 <= 2.5.1 | affected |
| AWS | AWS Encryption SDK for Python | 3 <= 3.3.0 | affected |
| AWS | AWS Encryption SDK for Python | 4 <= 4.0.4 | affected |
Weaknesses
- CWE-757: CWE-757 Selection of Less-Secure algorithm during negotiation ('algorithm downgrade')
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://aws.amazon.com/security/security-bulletins/2026-017-aws/
- https://github.com/aws/aws-encryption-sdk-python/releases/tag/v4.0.5
- https://github.com/aws/aws-encryption-sdk-python/releases/tag/v3.3.1
- https://github.com/aws/aws-encryption-sdk-python/security/advisories/GHSA-v638-38fc-rhfv
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