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High · 8.1 Public exploit CVE-2026-18830 EUVD-2026-52819GHSA-h8gv-mm2p-4q56

Insufficient input validation in Amazon Bedrock AgentCore harness InvokeHarness API

Published Aug 4, 2026 · Updated Oct 11, 2026 · Assigned by AMZN

Vendor: AWS Product: Amazon Bedrock AgentCore harness

Description

Insufficient input validation in Amazon Bedrock AgentCore harness might allow an authenticated remote user to execute configured tools bypassing model invocation and security controls via crafted content blocks in conversation messages. AWS has addressed this issue. No customer action is required.

Affected products

VendorProductAffectedFixed
AWS Amazon Bedrock AgentCore harness N/A —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • huzjie/aegisagent ★ 0 · Aug 11, 2026

    AegisAgent - Runtime security gateway & privilege governance for AI agents. Cryptographic tool-call provenance (CoreBreak/CVE-2026-18830/18236/64650 defense), policy engine, sandbox isolation, HITL a…

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References