{"id":"CVE-2026-115382","title":"Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 wasi:http Zero Timeout Panic DoS","summary":"Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a denial-of-service vulnerability in its wasi:http implementation that allows guests to panic the host. Guests can specify a zero between-bytes-timeout request option, which…","severity":"medium","cvss":4.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-1284"],"vendor":"bytecodealliance","product":"wasmtime","affected":["wasmtime >= 46.0.0 < 48.0.4","wasmtime >= 49.0.0 < 49.0.2"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-23T14:48:28.714813Z"},"published":"2026-10-22","updated":"2026-10-23","sourceUpdated":"2026-10-23T15:01:00.837Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115382","references":[{"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-w4qr-p94g-mjhv","label":"GitHub Security Advisory (GHSA-w4qr-p94g-mjhv)"},{"url":"https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.4-and-49.0.0-before-49.0.2-wasi-http-zero-timeout-panic-dos","label":"VulnCheck Advisory: Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 wasi:http Zero Timeout Panic DoS"},{"url":"https://crates.io/crates/wasmtime-wasi-http"},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0320.html"},{"url":"https://github.com/bytecodealliance/wasmtime/pull/14483"}],"tags":["cve.org","osv","rust"],"epss":0.00226,"epssPercentile":0.12617,"aliases":["RUSTSEC-2026-0320","GHSA-w4qr-p94g-mjhv"],"ecosystem":"rust","patched":["wasmtime-wasi-http 49.0.2"],"ingestedAt":"2026-10-22T22:00:50.404Z","slug":"CVE-2026-115382","body":"## Overview\n\nWasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a denial-of-service vulnerability in its wasi:http implementation that allows guests to panic the host. Guests can specify a zero between-bytes-timeout request option, which is forwarded directly to a Tokio API that panics, crashing the host embedding.\n\n## Affected\n\n- `wasmtime >= 46.0.0 < 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-2026-115382)\n\nAffected packages:\n\n- `wasmtime-wasi-http >= 49.0.0, < 49.0.2`\n\nPatched in:\n\n- `wasmtime-wasi-http 49.0.2`\n\nSource: https://osv.dev/vulnerability/RUSTSEC-2026-0320","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":26.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}