CVE-2026-115380

Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains a denial of service vulnerability in the wasmtime-wasi WASI preview 0 poll_oneoff adapter, which performs O(n) host work per subscription without consuming or checking fuel. Malicious guest modules can pass many subscriptions to force long-running host computation that ignores configured fuel limits.

Score

CVSS 4.0 5.1 Medium

Status

Deferred - disclosure@vulncheck.com

Published

2026-10-22

Last modified

2026-10-26

Weaknesses

CWE-770

Affected products

• Wasmtime (Bytecodealliance)

References

• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-j366-h8gg-77pm
• https://www.vulncheck.com/advisories/wasmtime-before-36.0.17-37.0.0-before-48.0.4-and-49.0.0-before-49.0.2-fuel-limit-b…