CVE-2026-62848 Metalama CVE debrief

Who should care

Defenders responsible for Visual Studio environments using Metalama, especially those with untrusted local processes, should assess exposure and apply the fix to prevent potential code execution.

Why it matters

The vulnerability allows for local code execution in Visual Studio environments using affected Metalama versions. Defenders should verify exposure and apply the fix to prevent potential code execution.

• Local code execution is possible for a process able to write to the named pipe
• Verification of exposure is necessary for Visual Studio environments using affected Metalama versions
• Fixing the vulnerability requires updating to Metalama version 2026.1.19 or later

Technical summary

The Metalama Visual Studio integration uses a local named-pipe channel for inter-process communication. This channel deserializes messages without restricting which CLR types can be instantiated, allowing a local process to send crafted messages that can instantiate arbitrary .NET types. This is a deserialization primitive similar to `BinaryFormatter` (CWE-502) and a known gadget-chain code-execution vector. The vulnerability is present in all Metalama releases from 2023.0 up to and including 2026.1.18, and is fixed in 2026.1.19.

Defensive priority

Defenders should prioritize verifying exposure of Visual Studio environments using Metalama, especially those with untrusted local processes, and apply the fix to prevent potential code execution.

Recommended defensive actions

• Verify Visual Studio environments using Metalama are updated to version 2026.1.19 or later
• Inventory and assess exposure of affected Metalama versions in your environment
• Restrict local access to the named pipe to trusted processes only
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The source corpus provides details on the vulnerability, affected versions, and the fix. However, it does not provide information on exploitation or specific victim impact. The CVE record was published on 2026-11-03T16:37:44.000Z and has not been modified since then. The source item providing details on the vulnerability. Official CVE Program record with source-provided CVE metadata. Official NIST NVD detail page and source-specific vulnerability assessment.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.