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CVE-2026-12957 is a high-severity improper trust boundary enforcement vulnerability in Language Servers for AWS before version 1.65.0 on all supported platforms, affecting Amazon Q Developer integrations that rely on this language server. When a user opens a maliciously crafted workspace and trusts it, attacker-controlled project configuration files can be automatically loaded and executed. Supporting reporting attributes the issue to unsafe handling of workspace-controlled Model Context Protocol (MCP) server configuration, including auto-loading of .amazonq/mcp.json from the repository and execution of configured commands/processes without a separate approval step. The spawned processes may inherit the developer's full environment, exposing secrets present in the session. The result is local arbitrary command/code execution in the context of the developer environment.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
36 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A separate Amazon Q vulnerability in which a poisoned repository could auto-load a configuration file and execute commands to steal a developer's AWS credentials after the workspace is trusted.
A vulnerability in Amazon Q Developer with a CVSS score of 8.5 that allowed automatic execution of malicious configuration files.
A high-severity arbitrary code execution vulnerability in the Amazon Q Developer extension for Visual Studio Code caused by unsafe automatic loading and execution of MCP server configurations from workspace files, enabling theft of AWS credentials and other developer-environment secrets.
A command execution vulnerability in the Amazon Q Developer extension caused by automatic execution of commands from workspace configuration files without user consent, potentially enabling theft of cloud credentials and API keys.
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.