CVE-2026-115381 bytecodealliance CVE debrief

Who should care

Defenders responsible for systems using wasmtime-wasi should assess exposure and prioritize verification and patching. Operators of affected systems should review the affected versions and upgrade to a fixed version. Vulnerability management teams should monitor for potential exploitation attempts and review compensating controls for exposed systems. Security teams should track exceptions, retest remediated assets, and close the item only after evidence is

Why it matters

Defenders should prioritize verifying the affected versions of wasmtime-wasi and applying patches or mitigations as needed to prevent potential memory allocation issues.

• Verify and patch vulnerable wasmtime-wasi versions to prevent potential memory allocation issues
• Monitor for potential exploitation attempts to prevent memory allocation issues
• Review and update affected systems to prevent potential memory allocation issues

Technical summary

The vulnerability is related to excessive allocated memory on the host when guests don't have stdio, affecting wasmtime-wasi. The affected package is wasmtime-wasi. Defenders should prioritize verifying the affected versions of wasmtime-wasi and applying patches or mitigations as needed to prevent potential memory allocation issues. The vulnerability has not been publicly exploited, but defenders should monitor for potential exploitation attempts. The source corpus provides limited information, and the CVE record and NVD entry offer additional context.

Defensive priority

Defenders should prioritize verifying the affected versions of wasmtime-wasi and applying patches or mitigations as needed.

Recommended defensive actions

• Verify the version of wasmtime-wasi in use and apply patches or mitigations as needed
• Review the affected versions and upgrade to a fixed version
• Monitor for potential exploitation attempts
• 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
• Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The source corpus provides limited information about the vulnerability, including a description of excessive allocated memory on the host when guests don't have stdio. The CVE record and NVD entry provide additional context. Evidence is limited, and defenders should verify the affected versions of wasmtime-wasi and apply patches or mitigations as needed. The vulnerability has not been publicly exploited, but defenders should monitor for potential exploitation attempts.

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.