CVE-2026-103956

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.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total 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

2.49% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 84.5% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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 2026-10-06.

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

2026-10-02 19:06Z27 DAYS AGO

Last updated

2026-10-09 16:36Z20 DAYS AGO

Reserved

2026-10-01

Assigning CNA

AMZN

Record state

PUBLISHED

Severity

Critical (CVSS 10.0)

CNA CVSS vector

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

Weaknesses

• CWE-306Missing Authentication for Critical FunctionBase
• CWE-1188Initialization of a Resource with an Insecure DefaultBase

Data version

5.2

Document digest

2c757f3e30608b64b5f8aa31e8c6f65bec292506bad8e07ac3045f25f321455a

• github.comhttps://github.com/awslabs/loom/releases/tag/v1.6.1release-notespatch
• aws.amazon.comhttps://aws.amazon.com/security/security-bulletins/2026-124-aws/vendor-advisory
• github.comhttps://github.com/awslabs/loom/security/advisories/GHSA-vgmj-998f-r8mpthird-party-advisory