CVE-2026-6550

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.10% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 0.8% of scored records. A rank, not a probability.

NVD base score

5.7 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-04-20 19:20Z4 MO AGO

Last updated

2026-04-20 19:44Z4 MO AGO

Reserved

2026-04-17

Assigning CNA

AMZN

Record state

PUBLISHED

Severity

Medium (CVSS 5.7)

CNA CVSS vector

CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Weaknesses

• CWE-757Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')Base

Data version

5.2

Document digest

9879db8681b895c05b5e5a16154d2cd074760babc7313d6017a94523c40db444

• aws.amazon.comhttps://aws.amazon.com/security/security-bulletins/2026-017-aws/vendor-advisory
• github.comhttps://github.com/aws/aws-encryption-sdk-python/releases/tag/v4.0.5patch
• github.comhttps://github.com/aws/aws-encryption-sdk-python/releases/tag/v3.3.1patch
• github.comhttps://github.com/aws/aws-encryption-sdk-python/security/advisories/GHSA-v638-38fc-rhfvthird-party-advisory