{"id":"CVE-2026-115384","title":"Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 Stack Buffer Overflow","summary":"Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a stack buffer overflow vulnerability that allows malicious guests to write ~16KB to the native stack via unvalidated async callback result types. Attackers can supply compo…","severity":"critical","cvss":9.9,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-20"],"vendor":"bytecodealliance","product":"wasmtime","affected":["wasmtime >= 39.0.0 < 48.0.4","wasmtime >= 49.0.0 < 49.0.2"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-29T02:30:31.803813Z"},"published":"2026-10-22","updated":"2026-10-29","sourceUpdated":"2026-10-29T02:30:40.462Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115384","references":[{"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-32h6-97mm-8q3c","label":"GitHub Security Advisory (GHSA-32h6-97mm-8q3c)"},{"url":"https://www.vulncheck.com/advisories/wasmtime-39.0.0-before-48.0.4-and-49.0.0-before-49.0.2-stack-buffer-overflow","label":"VulnCheck Advisory: Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 Stack Buffer Overflow"},{"url":"https://crates.io/crates/wasmtime"},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0327.html"},{"url":"https://github.com/bytecodealliance/wasmtime/pull/14471"}],"tags":["cve.org","osv","rust"],"epss":0.00312,"epssPercentile":0.24081,"aliases":["RUSTSEC-2026-0327","GHSA-32h6-97mm-8q3c"],"ecosystem":"rust","patched":["wasmtime 49.0.2"],"ingestedAt":"2026-10-22T22:00:50.404Z","slug":"CVE-2026-115384","body":"## Overview\n\nWasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a stack buffer overflow vulnerability that allows malicious guests to write ~16KB to the native stack via unvalidated async callback result types. Attackers can supply components with mistyped component-model-async callback functions to overwrite return addresses, crashing the host or escaping the sandbox.\n\n## Affected\n\n- `wasmtime >= 39.0.0 < 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-2026-115384)\n\nAffected packages:\n\n- `wasmtime >= 49.0.0, < 49.0.2`\n\nPatched in:\n\n- `wasmtime 49.0.2`\n\nSource: https://osv.dev/vulnerability/RUSTSEC-2026-0327","depth":"midnight","depthScore":55,"depthScoreParts":{"impact":54.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}