CVE-2026-115380 bytecodealliance CVE debrief

Who should care

Defenders responsible for systems using wasmtime-wasi should assess exposure and prioritize patching or mitigation. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify affected versions and apply patches or mitigations to prevent potential denial-of-service attacks. Security teams should review the affected functions and architectures to determine the scope of the vulnerability and monitor

Why it matters

Defenders should prioritize verifying the affected versions of wasmtime-wasi and applying patches or mitigations as recommended by the vendor to prevent potential denial-of-service attacks.

• Denial-of-service attacks may be possible due to circumvented fuel consumption.
• Defenders should verify affected versions and apply patches or mitigations.

Technical summary

The WASI preview 0 implementation of `poll_oneoff` in wasmtime-wasi circumvents fuel consumption, potentially leading to denial-of-service attacks. This vulnerability affects wasmtime-wasi and could allow attackers to cause denial-of-service attacks. Defenders should prioritize verifying the affected versions of wasmtime-wasi and applying patches or mitigations as recommended by the vendor to prevent potential denial-of-service attacks. The vulnerability is related to the WASI preview 0 implementation of `poll_oneoff` and fuel consumption.

Defensive priority

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

Recommended defensive actions

• Verify the version of wasmtime-wasi in use and apply patches or mitigations as recommended by the vendor.
• Monitor for any updates or advisories from the vendor regarding this vulnerability.
• Review the affected functions and architectures to determine the scope of the vulnerability.
• 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.
• 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 evidence for this CVE is based on the RustSec database entry for the Wasmtime security advisory, which mentions that the WASI preview 0 implementation of `poll_oneoff` circumvents fuel consumption.

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.