{"id":"CVE-2026-115384","summary":"Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 Stack Buffer Overflow","details":"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 components with mistyped component-model-async callback functions to overwrite return addresses, crashing the host or escaping the sandbox.","aliases":["GHSA-32h6-97mm-8q3c","RUSTSEC-2026-0327"],"modified":"2026-10-30T02:30:50.757358449Z","published":"2026-10-22T19:13:51.422Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-20"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115384.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115384.json"},{"type":"ADVISORY","url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-32h6-97mm-8q3c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115384"},{"type":"ADVISORY","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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bytecodealliance/wasmtime","events":[{"introduced":"56b81c98a2b4bfea4e7b1d6ac8f2e4196dc83fc1"},{"fixed":"d02ffd202850007ea953224f589a569e8830eb6c"},{"introduced":"17830bd3c0331d920a8aa38846eebc4d46d98c23"},{"fixed":"3c8a3e79aa3188a1a12b3aebbaa097abccceac92"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"39.0.0"},{"fixed":"48.0.4"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"49.0.0"},{"fixed":"49.0.2"}]}]}}],"versions":["v49.0.1","v49.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-115384.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"}]}