CVE-2026-12958: Language Servers for AWS vulnerable to arbitrary file write
Language Servers for AWS (the aws/language-servers project) provides the Language Server Protocol implementations that power AWS developer tooling, including the Amazon Q Developer agentic chat experience, across IDEs such as VS Code, JetBrains, Visual Studio, and Eclipse.
Missing symlink validation in Language Servers for AWS may allow an arbitrary file write outside of the workspace trust boundary. This may occur when a local user opens a workspace containing a maliciously crafted symlink that resolves to a file path outside the workspace trust boundary.
References
- aws.amazon.com/security/security-bulletins/2026-047-aws
- github.com/Amazon-Q-Developer/language-servers/commit/6c279b083cc192aa5df1f38c2c185576fd5234f5
- github.com/Amazon-Q-Developer/language-servers/pull/2742
- github.com/Amazon-Q-Developer/language-servers/releases/tag/agentic-rc-1.69.0
- github.com/Amazon-Q-Developer/language-servers/releases/tag/lsp-codewhisperer/v0.0.117
- github.com/advisories/GHSA-6v3r-4p5c-mrp5
- github.com/aws/language-servers/security/advisories/GHSA-6v3r-4p5c-mrp5
- nvd.nist.gov/vuln/detail/CVE-2026-12958
Code Behaviors & Features
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