{"cve":"CVE-2026-104855","nvd":{"published":"2026-10-02T18:17:02.083","modified":"2026-10-06T17:17:16.000","status":"Deferred","description":"Wasmtime is a runtime for WebAssembly. From 46.0.0 until 46.0.2 and 47.0.3, fuel and epoch preemption checks inside bulk operations including memory.copy, table.grow, and array.copy can expose invalid intermediate state when an embedder mutates a Store in Store::epoch_deadline_callback or continues using a Store after cancellation or a trap. A cancelled non-nullable table growth can leave null elements, linear-memory growth during memory.copy can invalidate retained raw pointers, and callback-triggered garbage collection during array.copy can invalidate GC pointers, resulting in a crash, invalid memory access, or GC heap corruption. Embeddings whose callbacks only access the host data in Store<T>, and embeddings that discard a Store after timeout or epoch deadline, are not affected. This issue is fixed in versions 46.0.2 and 47.0.3.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","score":2.0},"cvss_v3":null,"cwes":["CWE-362"],"references":["https://github.com/bytecodealliance/wasmtime/commit/3ebfbe5af4927c157d6fcaca42b8dbb6d17b73fb","https://github.com/bytecodealliance/wasmtime/commit/99b0bc39d447317a4102c056081c83a9a84a46e0","https://github.com/bytecodealliance/wasmtime/commit/a3eb27af01ba5a30320a90ea1405059cdfedd353","https://github.com/bytecodealliance/wasmtime/pull/14041","https://github.com/bytecodealliance/wasmtime/pull/14043"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:57:46.668721662+00:00"},"epss":{"cve":"CVE-2026-104855","score":0.00276,"percentile":0.1985,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-2hw9-mc66-jc2q","url":"https://osv.dev/vulnerability/GHSA-2hw9-mc66-jc2q","summary":"Wasmtime: Preemption and traps during bulk operations enable breaking internal VM state","modified":"2026-10-02T23:10:45.600982665Z","packages":[{"ecosystem":"crates.io","name":"wasmtime","purl":"pkg:cargo/wasmtime","ranges":[">=46.0.0 <46.0.2"],"fixed":["46.0.2"]},{"ecosystem":"crates.io","name":"wasmtime","purl":"pkg:cargo/wasmtime","ranges":[">=47.0.0 <47.0.3"],"fixed":["47.0.3"]}]},{"id":"RUSTSEC-2026-0223","url":"https://osv.dev/vulnerability/RUSTSEC-2026-0223","summary":"Preemption and traps during bulk operations enable breaking internal VM state","modified":"2026-10-12T18:00:14.899123980Z","packages":[{"ecosystem":"crates.io","name":"wasmtime","purl":"pkg:cargo/wasmtime","ranges":[">=46.0.0 <46.0.2",">=47.0.0 <47.0.3"],"fixed":["46.0.2","47.0.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}