CVE-2026-6550: Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python
AWS · AWS Encryption SDK for Python
Vendor fix available · Affected: AWS Encryption SDK for Python · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 0% of scored CVEs
DescriptionCVE.org
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 products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- AWS · AWS Encryption SDK for Pythonfrom 2 up to and including 2.5.1; from 3 up to and including 3.3.0; from 4 up to and including 4.0.4
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- AWS
- Published
- April 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-6550 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.