{"id":"EUVD-2026-21024","enisaUuid":"dcc24cd3-bdbe-3ac4-b195-52a0a65c16ab","description":"Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime\u0027s Winch compiler contains a bug where a 64-bit table, part of the memory64 proposal of WebAssembly, incorrectly translated the table.size instruction. This bug could lead to disclosing data on the host\u0027s stack to WebAssembly guests. The host\u0027s stack can possibly contain sensitive data related to other host-originating operations which is not intended to be disclosed to guests. This bug specifically arose from a mistake where the return value of table.size was statically typed as a 32-bit integer, as opposed to consulting the table\u0027s index type to see how large the returned register could be. When combined with details about Wnich\u0027s ABI, such as multi-value returns, this can be combined to read stack data from the host, within a guest. This vulnerability is fixed in 36.0.7, 42.0.2, and 43.0.1.","datePublished":"Apr 9, 2026, 6:40:48 PM","dateUpdated":"Apr 10, 2026, 2:12:18 PM","baseScore":2.3,"baseScoreVersion":"4.0","baseScoreVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N","references":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m9w2-8782-2946\n","aliases":"CVE-2026-34945\nGHSA-m9w2-8782-2946\n","assigner":"GitHub_M","epss":0.32,"enisaIdProduct":[{"id":"0095e70d-4272-3669-a453-0668887ef312","product":{"name":"wasmtime","vendor":{"name":"bytecodealliance"}},"product_version":"43.0.0, \u003c 44.0.1"},{"id":"25f79828-359e-31b8-a4e7-913beec8bbd7","product":{"name":"wasmtime","vendor":{"name":"bytecodealliance"}},"product_version":"37.0.0, \u003c 42.0.2"},{"id":"44c9f25c-100e-3b60-b13b-578b0fcc40b9","product":{"name":"wasmtime","vendor":{"name":"bytecodealliance"}},"product_version":"25.0.0, \u003c 36.0.7"}],"enisaIdVendor":[{"id":"a9a8cabb-9844-3893-9327-d53120be57c0","vendor":{"name":"bytecodealliance"}}],"enisaIdVulnerability":[{"id":"7e94f06e-eb2f-36e2-b054-53c1a910500c","vulnerability":{"id":"GHSA-m9w2-8782-2946","description":"Wasmtime has host data leakage with 64-bit tables and Winch","datePublished":"Apr 9, 2026, 8:23:02 PM","dateUpdated":"Apr 24, 2026, 9:03:32 PM","baseScore":0.0,"references":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m9w2-8782-2946\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34945\nhttps://github.com/bytecodealliance/wasmtime\nhttps://rustsec.org/advisories/RUSTSEC-2026-0086.html\n","enisa_id":"EUVD-2026-21024\n","aliases":"GHSA-m9w2-8782-2946\nCVE-2026-34945\n","epss":0.0,"dataProcessed":"Oct 25, 2026, 1:55:10 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}},{"id":"8f2f0be2-2aa1-3dd1-91a3-888d218b2ba7","vulnerability":{"id":"CVE-2026-34945","description":"Wasmtime is a runtime for WebAssembly. 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This vulnerability is fixed in 36.0.7, 42.0.2, and 43.0.1.","datePublished":"Apr 9, 2026, 6:40:48 PM","dateUpdated":"Apr 10, 2026, 2:12:18 PM","status":"PUBLISHED","baseScore":2.3,"baseScoreVersion":"4.0","baseScoreVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N","references":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m9w2-8782-2946\n","enisa_id":"EUVD-2026-21024\n","assigner":"GitHub_M","epss":0.32,"dataProcessed":"Oct 30, 2026, 7:19:03 AM","vulnerabilityProduct":[{"id":"b73cf5ee-1ea0-39db-9fb0-88702567826f","product":{"name":"wasmtime","vendor":{"name":"bytecodealliance"}},"product_version":"25.0.0, \u003c 36.0.7"},{"id":"c460d96f-0c51-3605-9e84-be741a18f738","product":{"name":"wasmtime","vendor":{"name":"bytecodealliance"}},"product_version":"43.0.0, \u003c 44.0.1"},{"id":"c5595c79-6635-3154-82e8-02089a5a052f","product":{"name":"wasmtime","vendor":{"name":"bytecodealliance"}},"product_version":"37.0.0, \u003c 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