CVE-2026-104855 bytecodealliance CVE debrief

Who should care

Defenders responsible for maintaining and securing systems that utilize the Wasmtime package should assess their exposure and take necessary actions to prevent potential disruptions.

Why it matters

Defenders should prioritize verifying the affected versions of the Wasmtime package and applying patches to prevent potential disruptions to internal VM state during bulk operations. The vulnerability's impact and exploitation details are not explicitly stated, so verification and patching are crucial.

• Verification of affected versions and application of patches is necessary to prevent disruptions
• Monitoring for potential disruptions to internal VM state during bulk operations is recommended

Technical summary

The Wasmtime package is vulnerable to preemption and traps during bulk operations, which can enable breaking internal VM state. The affected versions are 46.0.0, 46.0.1, 47.0.0, and 47.0.1. Patches are available in versions 46.0.2 and 47.0.3. Defenders should prioritize verifying the affected versions of the Wasmtime package and applying patches to prevent potential disruptions to internal VM state during bulk operations. The vulnerability's impact and exploitation details are not explicitly stated, so verification and patching are crucial.

Defensive priority

Defenders should prioritize verifying the affected versions of the Wasmtime package and applying patches to prevent potential disruptions to internal VM state during bulk operations.

Recommended defensive actions

• Verify the version of the Wasmtime package in use and apply patches if necessary
• Monitor for potential disruptions to internal VM state during bulk operations
• Review the GitHub-hosted security advisory for additional information
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The source corpus provides limited information about the vulnerability, including its description and affected versions. However, the details about the vulnerability's impact and exploitation are not explicitly stated.

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.