CVE-2026-119148: AWS Nitro Enclaves SDK for C use-after-free and KMS impersonation

CVE-2026-119148 · Severity: high · CVSS 7.8 · Published 2026-10-30

AWS Nitro Enclaves SDK for C contains two critical vulnerabilities affecting applications running in AWS Nitro Enclaves, a trusted execution environment used to isolate sensitive workloads like cryptographic operations. CVE-2026-119116 allows a local attacker on the parent EC2 instance to crash the enclave or execute arbitrary code within it; CVE-2026-119148 allows an attacker to impersonate AWS Key Management Service and inject forged cryptographic keys. Exploitation could lead to complete compromise of secrets managed by affected enclaves.

Technologies: Amazon AWS. Vendors: Amazon.

Quick answers

Is CVE-2026-119148 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-119148 being exploited in the wild.
How severe is CVE-2026-119148?
High severity, with a CVSS score of 7.8, published 30 October 2026.
Which products and versions are affected?
Amazon Nitro Enclaves SDK for C <= v0.4.5.
Is there a fix for CVE-2026-119148?
Yes: fixed in v0.4.6. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-119148 attacked?
It is attacked with local access or over the network, in a software library.
Am I affected by CVE-2026-119148?
Check whether you run Amazon AWS or Amazon Nitro Enclaves SDK for C at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Fixed in: v0.4.6

Technical details

CVE-2026-119116 is a use-after-free vulnerability in the kmstool-enclave command handler that processes vsock messages from the parent EC2 instance; an attacker with local access can send crafted messages to corrupt enclave heap memory and execute code. CVE-2026-119148 stems from insufficient input validation where the KMS server hostname is constructed from an unauthenticated region parameter, enabling DNS/network-level impersonation without cryptographic validation. Both require the SDK versions ≤ 0.4.5, with CVE-2026-119116 affecting only applications using or derived from kmstool-enclave.

Affected products

  • Amazon Nitro Enclaves SDK for C <= v0.4.5

Identifiers

  • CVE-2026-119148
  • CVE-2026-119116

Timeline

  • 2026-10-30: disclosed

References

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