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

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0010, the 1st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 15:02 UTC First seen by agentprime
2. 31 Oct 2026, 15:02 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-v638-38fc-rhfv
• OSV: GHSA-v638-38fc-rhfv
• github.com/aws/aws-encryption-sdk-python/security/advisories/GHSA-v638-38fc-rhfv
• github.com/google/security-research/security/advisories/GHSA-wqgp-vphw-hphf
• nvd.nist.gov/vuln/detail/CVE-2026-6550
• aws.amazon.com/security/security-bulletins/2026-017-aws
• github.com/aws/aws-encryption-sdk-python
• github.com/aws/aws-encryption-sdk-python/releases/tag/v3.3.1
• github.com/aws/aws-encryption-sdk-python/releases/tag/v4.0.5

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.