CVE-2026-119138 bytecodealliance CVE debrief

Who should care

Defenders responsible for Wasmtime deployments should assess exposure and apply patches or mitigations to prevent potential DoS attacks. Specifically, review Wasmtime configurations and update to version 48.0.6 or 49.0.3, or apply compensating controls to restrict access to sensitive resources.

Why it matters

Defenders should prioritize assessing exposure and applying patches or mitigations to prevent potential denial-of-service (DoS) attacks in Wasmtime deployments. The advisory provides limited information on the vulnerability, but it appears to be related to the handling of pending calls after a trap is triggered. Affected versions of Wasmtime are 46.0.0 and later up to 48.0.5 and 49.0.0 up to 49.0.2.

• Potential denial-of-service (DoS) attacks
• Exposure of Wasmtime configurations and versions
• Need for patching or mitigations to prevent attacks
• Potential impact on system availability

Technical summary

The Wasmtime runtime is vulnerable to a panic when pending calls are run after a trap is triggered. This issue is tracked as CVE-2026-119138 and affects versions 46.0.0 and later up to 48.0.5 and 49.0.0 up to 49.0.2. The CVSS score for this vulnerability is CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N. Defenders should prioritize assessing exposure and applying patches or mitigations to prevent potential denial-of-service (DoS) attacks. Specifically, review Wasmtime configurations and update to version 48.0.6 or 49.0.3, or apply compensating controls to restrict access to sensitive resources.

Defensive priority

Defenders should prioritize assessing exposure and applying patches or mitigations to prevent potential denial-of-service (DoS) attacks. Specifically, review Wasmtime configurations and update to version 48.0.6 or 49.0.3, or apply compensating controls to restrict access to sensitive resources.

Recommended defensive actions

• Assess exposure by reviewing Wasmtime configurations and versions
• Apply patches or mitigations to prevent potential DoS attacks
• Restrict access to sensitive resources
• Monitor for suspicious 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

Evidence notes

The advisory provides limited information on the vulnerability, but it appears to be related to the handling of pending calls after a trap is triggered. The affected versions of Wasmtime are 46.0.0 and later up to 48.0.5 and 49.0.0 up to 49.0.2. The advisory does not provide information on known exploitation or impact.

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.