{"id":"CVE-2026-115389","summary":"Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Denial of Service via Val API","details":"Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not adequately account for host allocations when lifting guest values through the dynamically-typed Val API, bypassing the hostcall fuel limit. A malicious WebAssembly guest can return crafted values that allocate at least ~100x more host memory than tracked, causing denial of service.","aliases":["GHSA-jqpg-j7w6-42pr","RUSTSEC-2026-0316"],"modified":"2026-10-31T02:30:38.740117791Z","published":"2026-10-22T19:13:55.163Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115389.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-770"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115389.json"},{"type":"ADVISORY","url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-jqpg-j7w6-42pr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115389"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/wasmtime-before-36.0.16-37.0.0-before-48.0.3-and-49.0.0-before-49.0.1-denial-of-service-via-val-api"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bytecodealliance/wasmtime","events":[{"introduced":"0"},{"fixed":"5cd4bf51aad8ae193823d35a05bfa97dd8dc3f11"},{"introduced":"7b3d6ae79e9153a2477668062f5622c10333925f"},{"fixed":"ebf20ab7cbf35fa3fbd8202562017fda6a541021"},{"introduced":"17830bd3c0331d920a8aa38846eebc4d46d98c23"},{"fixed":"46c23a87dac1465986a8ad53ba6a7ae49372857b"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0"},{"fixed":"36.0.16"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"range":[{"introduced":"37.0.0"},{"fixed":"48.0.3"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"strategy":"StandardRange","range":[{"introduced":"49.0.0"},{"fixed":"49.0.1"}],"source":"AFFECTED_FIELD"}]}}],"versions":["v49.0.0","v48.0.2","v36.0.15","v48.0.1","v36.0.14","v48.0.0","v36.0.13","v36.0.12","v36.0.11","v36.0.10","v36.0.9","v36.0.8","v36.0.7","v36.0.6","v36.0.5","dev","v36.0.4","v36.0.3","v36.0.2","v36.0.1","v36.0.0","v0.35.0","v0.33.0","v0.34.0","v0.32.0","v0.31.0","v0.30.0","v0.29.0","v0.28.0","v0.27.0","v0.26.0","v0.25.0","v0.24.0","v0.23.0","v0.22.0","cranelift-v0.69.0","v0.21.0","v0.20.0","v0.19.0","v0.18.0","v0.17.0","v0.16.0","cranelift-v0.61.0","cranelift-v0.60.0","v0.12.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-115389.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"}]}