CVE-2026-115392 bytecodealliance CVE debrief

Who should care

Defenders responsible for systems using Wasmtime should assess exposure and prioritize patching to prevent potential sandbox escapes. The vulnerability allows for unauthorized access and specific details on exploitation are limited. Inventory checks, monitoring, and patching are recommended. Defenders should prioritize patching Wasmtime to prevent potential sandbox escapes. Inventory checks and monitoring for unusual activity may be necessary.

Why it matters

Defenders should prioritize patching Wasmtime to prevent potential sandbox escapes. The vulnerability allows for unauthorized access and specific details on exploitation are limited. Inventory checks, monitoring, and patching are recommended.

• Potential sandbox escape, allowing for unauthorized access
• Need to verify affected versions and patch levels
• Inventory checks and monitoring for unusual activity may be necessary

Technical summary

The vulnerability allows for a sandbox escape when paths or symlinks contain trailing slashes in Wasmtime. The advisory is recorded in the RustSec database and a CVE entry was created. The vulnerability allows for unauthorized access and specific details on exploitation are limited. Defenders should prioritize patching Wasmtime to prevent potential sandbox escapes. Inventory checks and monitoring for unusual activity may be necessary. The vulnerability allows for a sandbox escape, allowing for unauthorized access. Specific details on exploitation are limited.

Defensive priority

Defenders should prioritize patching Wasmtime to prevent potential sandbox escapes. Inventory checks and monitoring for unusual activity may be necessary.

Recommended defensive actions

• Patch Wasmtime to the latest version
• Inventory and verify affected systems
• Monitor for unusual activity
• 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
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The advisory is based on information from the RustSec database and a GitHub-hosted security advisory. Specific details on exploitation and impact are limited. The vulnerability allows for a sandbox escape when paths or symlinks contain trailing slashes in Wasmtime. Defenders should prioritize patching Wasmtime to prevent potential sandbox escapes. Inventory checks and monitoring for unusual activity may be necessary.

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.