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Arbitrary file write in Language Servers for AWS

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-12958
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 01:58 UTC · Revision 1

Source evidence

Arbitrary file write in Language Servers for AWS

core-osv · Original source

Published 23 Jun 2026, 16:03 UTC

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.

osv:CVE-2026-12958
Complete source record
{
  "id": "cba861e99e9a54db4458ae414630a5ecf5dfa653bd202d04b003565f3dc07150",
  "url": "https://osv.dev/vulnerability/CVE-2026-12958",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-12958",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-12958",
      "aliases": [
        "CVE-2026-12958",
        "GHSA-6v3r-4p5c-mrp5"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/Amazon-Q-Developer/language-servers",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "7ea760dd4c4e30e12795a83726c38cdce7ea6522"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.69.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12958.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.652141854Z",
      "provider": "osv",
      "references": [
        "https://aws.amazon.com/security/security-bulletins/2026-047-aws/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12958.json",
        "https://github.com/aws/language-servers/security/advisories/GHSA-6v3r-4p5c-mrp5",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-12958"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-61"
        ],
        "cna_assigner": "AMZN",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12958.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-12958",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499514,
  "published_at": "2026-06-23T16:03:01.746+00:00"
}