HighVulnerability

GHSA-6v3r-4p5c-mrp5: Language Servers for AWS vulnerable to arbitrary file write

Source: GitHub Advisory(opens in a new tab)
Identifiers: CVE-2026-12958GHSA-6v3r-4p5c-mrp5
Published: September 24, 2026
Record updated: October 9, 2026

Affected: @aws/lsp-codewhisperer < 0.0.117
Fixed in: 0.0.117
released May 26, 2026, 121 days before disclosure
Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.2%

Summary

Missing symlink validation in Language Servers for AWS (aws/language-servers) may allow an arbitrary file write outside the workspace trust boundary. Impacted versions are Language Servers for AWS <1.69.0. The agent may follow a symlink inside a trusted workspace to an external location and write there without prompting the user for approval.

Mitigation

Fixed in AWS Language Servers version 1.69.0. Upgrade to the latest version and ensure any forked or derivative code is patched with the new fixes. No workarounds are available.

Details

Scores and exploitation

Patch available: Yes
EPSS: 0.2%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 10, 2026.
Disclosure date: September 24, 2026

Affected

Packages: @aws/lsp-codewhisperer@< 0.0.117 (fixed: 0.0.117)
Vendors: Amazon

Classification

Attack type: Other
Attack sophistication: Moderate
AI component targeted: Agent
Impact: Integrity
Labels: security,
industry

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative.

Original source: https://github.com/advisories/GHSA-6v3r-4p5c-mrp5

First tracked: September 24, 2026 at 08:01 PM ET, from GitHub Advisory Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 85% (self-assessed)

Summary

Mitigation

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