{"id":"EUVD-2026-21039","enisaUuid":"b7498e4a-0bac-3053-a5ff-9dc9a1ae0f7e","description":"Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime\u0027s implementation of transcoding strings between components contains a bug where the return value of a guest component\u0027s realloc is not validated before the host attempts to write through the pointer. This enables a guest to cause the host to write arbitrary transcoded string bytes to an arbitrary location up to 4GiB away from the base of linear memory. These writes on the host could hit unmapped memory or could corrupt host data structures depending on Wasmtime\u0027s configuration. Wasmtime by default reserves 4GiB of virtual memory for a guest\u0027s linear memory meaning that this bug will by default on hosts cause the host to hit unmapped memory and abort the process due to an unhandled fault. Wasmtime can be configured, however, to reserve less memory for a guest and to remove all guard pages, so some configurations of Wasmtime may lead to corruption of data outside of a guest\u0027s linear memory, such as host data structures or other guests\u0027s linear memories. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1.","datePublished":"Apr 9, 2026, 6:55:56 PM","dateUpdated":"Apr 13, 2026, 3:38:27 PM","baseScore":6.1,"baseScoreVersion":"4.0","baseScoreVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N","references":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-394w-hwhg-8vgm\n","aliases":"CVE-2026-35195\nGHSA-394w-hwhg-8vgm\n","assigner":"GitHub_M","epss":0.22,"enisaIdProduct":[{"id":"20d49d20-6529-3d68-83d0-48168efd97d0","product":{"name":"wasmtime","vendor":{"name":"bytecodealliance"}},"product_version":"25.0.0, \u003c 36.0.7"},{"id":"37c9516b-db78-3c10-9f11-3257de5fcda4","product":{"name":"wasmtime","vendor":{"name":"bytecodealliance"}},"product_version":"\u003c 24.0.7"},{"id":"6c6b6f39-9265-36a1-9bc8-b0402fec8353","product":{"name":"wasmtime","vendor":{"name":"bytecodealliance"}},"product_version":"37.0.0, \u003c 42.0.2"},{"id":"86cd9fb3-8b25-3967-8f90-20c9c6a948df","product":{"name":"wasmtime","vendor":{"name":"bytecodealliance"}},"product_version":"43.0.0, \u003c 44.0.1"}],"enisaIdVendor":[{"id":"f4704baf-90d5-36f3-b548-20c542fadf51","vendor":{"name":"bytecodealliance"}}],"enisaIdVulnerability":[{"id":"5a84fffc-717d-35f3-8e80-d669577910b1","vulnerability":{"id":"CVE-2026-35195","description":"Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime\u0027s implementation of transcoding strings between components contains a bug where the return value of a guest component\u0027s realloc is not validated before the host attempts to write through the pointer. This enables a guest to cause the host to write arbitrary transcoded string bytes to an arbitrary location up to 4GiB away from the base of linear memory. These writes on the host could hit unmapped memory or could corrupt host data structures depending on Wasmtime\u0027s configuration. Wasmtime by default reserves 4GiB of virtual memory for a guest\u0027s linear memory meaning that this bug will by default on hosts cause the host to hit unmapped memory and abort the process due to an unhandled fault. Wasmtime can be configured, however, to reserve less memory for a guest and to remove all guard pages, so some configurations of Wasmtime may lead to corruption of data outside of a guest\u0027s linear memory, such as host data structures or other guests\u0027s linear memories. This vulnerability is fixed in 24.0.7, 36.0.7, 42.0.2, and 43.0.1.","datePublished":"Apr 9, 2026, 6:55:56 PM","dateUpdated":"Apr 13, 2026, 3:38:27 PM","status":"PUBLISHED","baseScore":6.1,"baseScoreVersion":"4.0","baseScoreVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N","references":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-394w-hwhg-8vgm\n","enisa_id":"EUVD-2026-21039\n","assigner":"GitHub_M","epss":0.22,"dataProcessed":"Oct 27, 2026, 7:19:04 AM","vulnerabilityProduct":[{"id":"5c948615-8fba-3992-b947-a2f76a66d4cb","product":{"name":"wasmtime","vendor":{"name":"bytecodealliance"}},"product_version":"\u003c 24.0.7"},{"id":"7ed5ee46-66a9-38e7-8048-388140762fb1","product":{"name":"wasmtime","vendor":{"name":"bytecodealliance"}},"product_version":"37.0.0, \u003c 42.0.2"},{"id":"b38b7200-fa0f-3270-950c-8edf49862b0f","product":{"name":"wasmtime","vendor":{"name":"bytecodealliance"}},"product_version":"25.0.0, \u003c 36.0.7"},{"id":"f0525471-5f2b-3103-820a-dcfdc34fe9ea","product":{"name":"wasmtime","vendor":{"name":"bytecodealliance"}},"product_version":"43.0.0, \u003c 44.0.1"}],"vulnerabilityVendor":[{"id":"0cf18ff4-2749-3f6a-8122-615b49207618","vendor":{"name":"bytecodealliance"}}]}},{"id":"8838705b-6f2b-33a0-9c15-1bc990ab7840","vulnerability":{"id":"GHSA-394w-hwhg-8vgm","description":"Wasmtime has out-of-bounds write or crash when transcoding component model strings","datePublished":"Apr 9, 2026, 8:24:12 PM","dateUpdated":"Apr 10, 2026, 2:40:30 PM","baseScore":0.0,"references":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-394w-hwhg-8vgm\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-35195\nhttps://github.com/bytecodealliance/wasmtime\nhttps://rustsec.org/advisories/RUSTSEC-2026-0091.html\n","enisa_id":"EUVD-2026-21039\n","aliases":"GHSA-394w-hwhg-8vgm\nCVE-2026-35195\n","epss":0.0,"dataProcessed":"Oct 25, 2026, 1:55:10 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}}],"enisaIdAdvisory":[{"id":"5c603775-1c8d-346a-bcca-2af5fc174051","advisory":{"id":"openSUSE-SU-2026:20749-1","description":"Security update for tree-sitter","summary":"Security update for tree-sitter","datePublished":"May 14, 2026, 8:07:53 AM","dateUpdated":"Sep 29, 2026, 5:31:22 PM","baseScore":0.0,"references":"https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_20749-1.json\nhttps://bugzilla.suse.com/1259205\nhttps://bugzilla.suse.com/1261839\nhttps://bugzilla.suse.com/1261871\nhttps://bugzilla.suse.com/1261894\nhttps://bugzilla.suse.com/1261954\nhttps://bugzilla.suse.com/1261963\nhttps://bugzilla.suse.com/1261968\nhttps://bugzilla.suse.com/1261974\nhttps://bugzilla.suse.com/1262007\nhttps://bugzilla.suse.com/1262032\nhttps://bugzilla.suse.com/1262036\nhttps://bugzilla.suse.com/1262040\nhttps://www.suse.com/security/cve/CVE-2026-34941/\nhttps://www.suse.com/security/cve/CVE-2026-34942/\nhttps://www.suse.com/security/cve/CVE-2026-34943/\nhttps://www.suse.com/security/cve/CVE-2026-34944/\nhttps://www.suse.com/security/cve/CVE-2026-34945/\nhttps://www.suse.com/security/cve/CVE-2026-34946/\nhttps://www.suse.com/security/cve/CVE-2026-34987/\nhttps://www.suse.com/security/cve/CVE-2026-34988/\nhttps://www.suse.com/security/cve/CVE-2026-35186/\nhttps://www.suse.com/security/cve/CVE-2026-35195/\n","aliases":"CVE-2026-34941\nCVE-2026-34942\nCVE-2026-34943\nCVE-2026-34944\nCVE-2026-34945\nCVE-2026-34946\nCVE-2026-34987\nCVE-2026-34988\nCVE-2026-35186\nCVE-2026-35195\n","source":{"id":21,"name":"csaf_opensuse"},"advisoryProduct":[{"id":"05a5180b-019b-3bc0-842e-6e10b13980aa","product":{"name":"libtree-sitter0_26-0:0.26.8-160000.1.1.ppc64le","vendor":{"name":"SUSE"}}},{"id":"091ff1ee-8d0a-3d7a-84a6-974ec06bdd61","product":{"name":"tree-sitter-0:0.26.8-160000.1.1.aarch64","vendor":{"name":"SUSE"}}},{"id":"186339de-7392-332c-ae2a-d52668025bf4","product":{"name":"tree-sitter-0:0.26.8-160000.1.1.x86_64","vendor":{"name":"SUSE"}}},{"id":"2c4b7093-90ac-3e4b-a5f2-9c435c558dbc","product":{"name":"libtree-sitter0_26-0:0.26.8-160000.1.1.aarch64","vendor":{"name":"SUSE"}}},{"id":"2f03a92a-d648-36bb-a099-32561164df42","product":{"name":"tree-sitter-devel-0:0.26.8-160000.1.1.s390x","vendor":{"name":"SUSE"}}},{"id":"5181887b-e734-3865-a234-0646418c1be5","product":{"name":"libtree-sitter0_26-0:0.26.8-160000.1.1.s390x","vendor":{"name":"SUSE"}}},{"id":"5a1f6f47-f16c-3430-b69c-16f6d8a833dc","product":{"name":"tree-sitter-0:0.26.8-160000.1.1.ppc64le","vendor":{"name":"SUSE"}}},{"id":"60c9ec65-b40b-3a55-869e-d50306f09f2e","product":{"name":"libtree-sitter0_26-0:0.26.8-160000.1.1.x86_64","vendor":{"name":"SUSE"}}},{"id":"6735312c-af30-39da-807a-5879276e3edb","product":{"name":"openSUSE 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