CVE-2026-6550Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python
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It affects AWS Encryption SDK for Python. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 4.7 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-757
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- AMZN
- NVD analysis
- Awaiting Analysis
- Record last updated
- Apr 20, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
AWS AWS Encryption SDK for Python aws:encryption_sdk_for_python (from the name) | from 2 through 2.5.1; from 3 through 3.3.0; from 4 through 4.0.4 | CNA record |
References
- https://aws.amazon.com/security/security-bulletins/2026-017-aws/vendor-advisory
- https://github.com/aws/aws-encryption-sdk-python/releases/tag/v4.0.5patch
- https://github.com/aws/aws-encryption-sdk-python/releases/tag/v3.3.1patch
- https://github.com/aws/aws-encryption-sdk-python/security/advisories/GHSA-v638-38fc-rhfvthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.