{"id":"CVE-2026-115380","title":"Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Fuel Limit Bypass DoS via WASI Preview 0 poll_oneoff","summary":"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 …","severity":"medium","cvss":4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cvssSource":"cna","cwe":["CWE-770"],"vendor":"bytecodealliance","product":"wasmtime","affected":["wasmtime < 36.0.17","wasmtime >= 37.0.0 < 48.0.4","wasmtime >= 49.0.0 < 49.0.2"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-26T19:27:18.578210Z"},"published":"2026-10-22","updated":"2026-10-26","sourceUpdated":"2026-10-26T19:38:30.038Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115380","references":[{"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-j366-h8gg-77pm","label":"GitHub Security Advisory (GHSA-j366-h8gg-77pm)"},{"url":"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-bypass-dos-via-wasi-preview-0-poll-oneoff","label":"VulnCheck Advisory: Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Fuel Limit Bypass DoS via WASI Preview 0 poll_oneoff"},{"url":"https://crates.io/crates/wasmtime-wasi"},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0321.html"},{"url":"https://github.com/bytecodealliance/wasmtime/pull/14481"}],"tags":["cve.org","osv","rust"],"epss":0.00118,"epssPercentile":0.01722,"aliases":["RUSTSEC-2026-0321","GHSA-j366-h8gg-77pm"],"ecosystem":"rust","patched":["wasmtime-wasi 49.0.2"],"ingestedAt":"2026-10-22T22:00:50.403Z","slug":"CVE-2026-115380","body":"## Overview\n\nWasmtime 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.\n\n## Affected\n\n- `wasmtime < 36.0.17`\n- `wasmtime >= 37.0.0 < 48.0.4`\n- `wasmtime >= 49.0.0 < 49.0.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-115380)\n\nAffected packages:\n\n- `wasmtime-wasi >= 49.0.0, < 49.0.2`\n\nPatched in:\n\n- `wasmtime-wasi 49.0.2`\n\nSource: https://osv.dev/vulnerability/RUSTSEC-2026-0321","depth":"sunlit","depthScore":22,"depthScoreParts":{"impact":22,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}