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GHSA-6V3R-4P5C-MRP5

Vulnerability from github – Published: 2026-09-24 19:15 – Updated: 2026-09-24 19:15

Summary

Language Servers for AWS vulnerable to arbitrary file write

Details

Summary

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.

Impact

If a user opens a maliciously crafted workspace containing a symlink that resides within the workspace but resolves to a location outside the workspace trust boundary, the agent may follow that symlink and write to the external location without prompting the user for approval. This can result in the modification of files outside the intended workspace boundary.

This issue is triggered when a user opens a workspace, trusts it, and the agent subsequently writes to a path within that workspace.

Impacted versions: Language Servers for AWS version <1.69.0.

Patches

This issue has been addressed in AWS Language Servers version 1.69.0. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.

Workarounds

No workarounds are available.

References

If you have any questions or comments about this advisory, AWS Security ask that you contact them via their vulnerability reporting page or directly via email to aws-security@amazon.com. Please do not create a public GitHub issue.

Acknowledgement

AWS Security would like to thank Wiz and Maor Dokhanian for collaborating on this issue through the coordinated vulnerability disclosure process.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

8.5 (High)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@aws/lsp-codewhisperer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.117"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-12958"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-61"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-24T19:15:39Z",
    "nvd_published_at": "2026-06-23T17:16:41Z",
    "severity": "HIGH"
  },
  "details": "## Summary\nLanguage 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.\n\nMissing 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.\n\n## Impact\n\nIf a user opens a maliciously crafted workspace containing a symlink that resides within the workspace but resolves to a location outside the workspace trust boundary, the agent may follow that symlink and write to the external location without prompting the user for approval. This can result in the modification of files outside the intended workspace boundary.\n\nThis issue is triggered when a user opens a workspace, trusts it, and the agent subsequently writes to a path within that workspace.\n\nImpacted versions: Language Servers for AWS version \u003c1.69.0.\n\n## Patches\nThis issue has been addressed in AWS Language Servers version 1.69.0. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes. \n\n## Workarounds\nNo workarounds are available.\n\n## References\nIf you have any questions or comments about this advisory, AWS Security ask that you contact them via their [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting) or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.\n\n## Acknowledgement \n\nAWS Security would like to thank Wiz and Maor Dokhanian for collaborating on this issue through the coordinated vulnerability disclosure process.",
  "id": "GHSA-6v3r-4p5c-mrp5",
  "modified": "2026-09-24T19:15:40Z",
  "published": "2026-09-24T19:15:39Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/aws/language-servers/security/advisories/GHSA-6v3r-4p5c-mrp5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-12958"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Amazon-Q-Developer/language-servers/pull/2742"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Amazon-Q-Developer/language-servers/commit/6c279b083cc192aa5df1f38c2c185576fd5234f5"
    },
    {
      "type": "WEB",
      "url": "https://aws.amazon.com/security/security-bulletins/2026-047-aws"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Amazon-Q-Developer/language-servers/releases/tag/agentic-rc-1.69.0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Amazon-Q-Developer/language-servers/releases/tag/lsp-codewhisperer/v0.0.117"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/aws/language-servers"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Language Servers for AWS vulnerable to arbitrary file write"
}

CVE-2026-12958 (GCVE-0-2026-12958)

Vulnerability from cvelistv5 – Published: 2026-06-23 16:03 – Updated: 2026-06-23 17:56

Title

Arbitrary file write in Language Servers for AWS

Summary

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 with a maliciously crafted symlink that resolves to a file path outside the workspace trust boundary. To remediate this issue, users should upgrade to version 1.69.0 or higher.

Severity

8.5 (High)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-23 17:56 UTC

CWE

CWE-61 - UNIX symbolic link (symlink) following

Assigner

AMZN mitre root

References

2 references

URL	Tags
https://aws.amazon.com/security/security-bulletin…	vendor-advisory
https://github.com/aws/language-servers/security/…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Amazon Web Services	Language Servers for AWS	Affected: 0 , < 1.69.0 (semver)

Show details on NVD website

JSON

To clipboard

{
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        "metrics": [
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                "id": "CVE-2026-12958",
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                "role": "CISA Coordinator",
                "timestamp": "2026-06-23T17:56:07.932599Z",
                "version": "2.0.3"
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      "metrics": [
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

GHSA-6V3R-4P5C-MRP5

Summary

Impact

Patches

Workarounds

References

Acknowledgement

CVE-2026-12958 (GCVE-0-2026-12958)

Tags

Sightings

Nomenclature

Related by attack behaviour