{"action":"Upgrade aws-encryption-sdk to 3.3.1 or later.","affected":[{"fixed":"3.3.1","introduced":"2.0.0"},{"fixed":"4.0.5","introduced":"4.0.0"}],"component":"aws-encryption-sdk","cve_ids":["CVE-2026-6550"],"ecosystem":"PyPI","epss":0.00096,"exploited":false,"fixed_versions":["3.3.1","4.0.5"],"ghsa_id":"GHSA-v638-38fc-rhfv","id":"tcs_01M5KGZ5ETZA1CBJWHVGTWYP2V","modified_at":"2026-07-13T16:31:31.667962786Z","published_at":"2026-07-13T15:02:53.143381Z","references":["https://osv.dev/vulnerability/PYSEC-2026-2387","https://github.com/aws/aws-encryption-sdk-python/security/advisories/GHSA-v638-38fc-rhfv","https://github.com/google/security-research/security/advisories/GHSA-wqgp-vphw-hphf","https://nvd.nist.gov/vuln/detail/CVE-2026-6550","https://aws.amazon.com/security/security-bulletins/2026-017-aws","https://github.com/aws/aws-encryption-sdk-python","https://github.com/aws/aws-encryption-sdk-python/releases/tag/v3.3.1","https://github.com/aws/aws-encryption-sdk-python/releases/tag/v4.0.5","https://pypi.org/project/aws-encryption-sdk","https://github.com/advisories/GHSA-v638-38fc-rhfv"],"severity":{"label":"medium","score":4.7},"sources":[{"source":"osv","source_id":"PYSEC-2026-2387","url":"https://osv.dev/vulnerability/PYSEC-2026-2387"}],"summary":"AWS Encryption SDK for Python: Key commitment policy bypass via shared key cache"}