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First reported 21 Jul · updated 29 Aug · 3 reports embracethered.com

AWS Kiro: Arbitrary Code Execution via Indirect Prompt Injection

Researchers found a vulnerability (CVE-2026-10591) in AWS Kiro, an agentic IDE, where hidden instructions planted in a web page or source file that Kiro processes can trigger indirect prompt injection to rewrite Kiro's own MCP server configuration (~/.kiro/settings/mcp.json) or allowlist arbitrary Bash commands in .vscode/settings.json, achieving arbitrary code execution on the developer's machine with no approval prompt. The human-in-the-loop approval boundary is bypassed because Kiro can write to these config files without user consent, and AWS has issued a fix and CVE.

indirect-prompt-injection · prompt-injection · remote-code-execution · tool-abuse · config-poisoning
ai-agents · mcp · llm · agentic-ide

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First reported 9 Aug arxiv.org

When Safety Becomes a Vulnerability: Exploiting LLM Alignment Homogeneity for Transferable Blocking in RAG

Researchers present TabooRAG, a blocking attack against Retrieval-Augmented Generation systems that exploits what they call 'alignment homogeneity'—shared refusal criteria across safety-aligned LLMs—to craft poisoned documents that cause models to refuse benign queries. Rather than injecting instructions, TabooRAG builds query-relevant risk context in a surrogate environment and transfers it to unknown target systems, achieving state-of-the-art attack success across nine LLMs and three datasets with a 67.3% relative gain over baselines even after prompt-injection filtering.

First reported 8 Aug cve.org

CVE Record: CVE-2026-47427

CVE-2026-47427 is a null pointer dereference denial-of-service in GitHub's official MCP Server (github-mcp-server) prior to version 1.1.0, where the CompletionsHandler in pkg/github/server.go accesses params.Ref without a nil check. A completion/complete JSON-RPC request with a missing or empty ref field triggers a Go runtime panic before any authentication, letting any unauthenticated client crash the server. The issue is fixed in version 1.1.0 (CVSS 7.5 HIGH).

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