{"id":"CVE-2026-44216","title":"Wasmtime is a runtime for WebAssembly","summary":"Wasmtime is a runtime for WebAssembly. From 30.0.0 to 36.0.8, 43.0.2, and 44.0.1, Wasmtime's allocation logic for a WebAssembly table contained checked arithmetic which panicked on overflow. This overflow is possible to trigger, and thus…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-770","CWE-190"],"vendor":"bytecodealliance","product":"wasmtime","affected":["wasmtime >= 30.0.0, < 36.0.8","wasmtime >= 37.0.0, < 43.0.2","wasmtime = 44.0.0"],"patched":["wasmtime 43.0.2"],"published":"2026-05-14","updated":"2026-07-13","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-44216","references":[{"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p8xm-42r7-89xg","label":"security-advisories@github.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:38187","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-44216","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477467","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44216.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}],"tags":["nvd"],"epss":0.00319,"epssPercentile":0.25089,"ingestedAt":"2026-07-13T13:27:17.972Z","slug":"CVE-2026-44216","body":"## Overview\n\nWasmtime is a runtime for WebAssembly. From 30.0.0 to 36.0.8, 43.0.2, and 44.0.1, Wasmtime's allocation logic for a WebAssembly table contained checked arithmetic which panicked on overflow. This overflow is possible to trigger, and thus panic, when a table with an extremely large size is allocated. This is possible with the WebAssembly memory64 proposal where tables can have sizes in the 64-bit range as opposed to the previous 32-bit range which would not overflow. The panic happens when attempting to create a very large table, such as when instantiating a WebAssembly module or component. This vulnerability is fixed in 36.0.8, 43.0.2, and 44.0.1.\n\n## Affected\n\n- `wasmtime >= 30.0.0, < 36.0.8`\n- `wasmtime >= 37.0.0, < 43.0.2`\n- `wasmtime = 44.0.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `wasmtime 43.0.2`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}