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CVE-2026-18830 is an insufficient input-validation vulnerability in the Amazon Bedrock AgentCore harness InvokeHarness API. Before AWS's server-side remediation, an authenticated caller could submit a conversation whose most recent message contained a crafted tool-use content block. The harness event loop could treat this caller-supplied block as an authorized tool invocation and dispatch the named configured tool directly, without a model invocation or enforcement of the security controls associated with model-mediated tool selection.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An insufficient input validation flaw in Amazon Bedrock AgentCore's InvokeHarness path that allowed an authenticated remote user to inject a tool-use block and trigger tool execution without a legitimate model turn.
An insufficient input validation vulnerability in Amazon Bedrock AgentCore harness that could allow an authenticated remote user to execute configured tools while bypassing model invocation and security controls through crafted conversation message content blocks.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.