{"id":"EUVD-2026-20990","revision":null,"records":[{"revision":"f6cf784f4c7b4e6ea6dcdef4e77e7c56","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-34942","aliases":[],"title":"Wasmtime panics when transcoding misaligned utf-16 strings","description":"Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime's implementation of transcoding strings into the Component Model's utf16 or latin1+utf16 encodings improperly verified the alignment of reallocated strings. This meant that unaligned pointers could be passed to the host for transcoding which would trigger a host panic. This panic is possible to trigger from malicious guests which transfer very specific strings across components with specific addresses. Host panics are considered a DoS vector in Wasmtime as the panic conditions are controlled by the guest in this situation. 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Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-20990","identifiers":["EUVD-2026-20990","CVE-2026-34942","GHSA-jxhv-7h78-9775"]},"retained":false,"historicalAffected":[]},{"revision":"72d5f717b88a460cbcfe9f19ec7b10de","observedAt":"2026-10-27T09:03:08.102+00:00","statement":{"source":"nvd","id":"CVE-2026-34942","aliases":[],"title":"Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime's implementation of transcoding strings into the Component Model's utf16 or latin1+utf16 encodings improperly verified the alignment of reallocated…","description":"Wasmtime is a runtime for WebAssembly. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-34942","identifiers":["CVE-2026-34942"]},"retained":false,"historicalAffected":[]},{"revision":"9717c3ca3d744e6c85f431a22cd4c4e5","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"GHSA-jxhv-7h78-9775","aliases":["CVE-2026-34942","RUSTSEC-2026-0092"],"title":"Wasmtime: Panic when transcoding misaligned utf-16 strings","description":"### Impact\n\nWasmtime's implementation of transcoding strings into the Component Model's `utf16` or `latin1+utf16` encodings improperly verified the alignment of reallocated strings. This meant that unaligned pointers could be passed to the host for transcoding which would trigger a host panic. This panic is possible to trigger from malicious guests which transfer very specific strings across components with specific addresses. \n\nHost panics are considered a DoS vector in Wasmtime as the panic conditions are controlled by the guest in this situation.\n\n### Patches\n\nWasmtime 24.0.7, 36.0.7, 42.0.2, and 43.0.1 have been issued to fix this bug. Users are recommended to update to these patched versions of Wasmtime.\n\n### Workarounds\n\nThere is no workaround for this bug. Hosts are recommended to updated to a patched version of Wasmtime.","state":0,"publishedAt":"2026-04-09T20:22:12+00:00","modifiedAt":"2026-09-10T03:50:44.7075583+00:00","affected":[{"ecosystem":"crates.io","name":"wasmtime","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"24.0.7"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"crates.io","name":"wasmtime","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"25.0.0"},{"kind":"fixed","version":"36.0.7"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"crates.io","name":"wasmtime","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"37.0.0"},{"kind":"fixed","version":"42.0.2"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"crates.io","name":"wasmtime","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"43.0.0"},{"kind":"fixed","version":"43.0.1"}]}],"versions":["43.0.0"],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-jxhv-7h78-9775","https://nvd.nist.gov/vuln/detail/CVE-2026-34942","https://github.com/bytecodealliance/wasmtime","https://rustsec.org/advisories/RUSTSEC-2026-0092.html"],"sourceUrl":"https://github.com/advisories/GHSA-jxhv-7h78-9775","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-jxhv-7h78-9775","identifiers":["GHSA-jxhv-7h78-9775","CVE-2026-34942","RUSTSEC-2026-0092"]},"retained":false,"historicalAffected":[]},{"revision":"00304931f1d244448ad30e56e6ff37ac","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"RUSTSEC-2026-0092","aliases":["CVE-2026-34942","GHSA-jxhv-7h78-9775"],"title":"Panic when transcoding misaligned component model UTF-16 strings","description":"This is an entry in the RustSec database for the Wasmtime security advisory\nlocated at\nhttps://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-jxhv-7h78-9775\nFor more information see the GitHub-hosted security advisory.","state":0,"publishedAt":"2026-04-09T12:00:00+00:00","modifiedAt":"2026-10-12T18:00:13.0654883+00:00","affected":[{"ecosystem":"crates.io","name":"wasmtime","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.0.0-0"},{"kind":"fixed","version":"24.0.7"},{"kind":"introduced","version":"25.0.0"},{"kind":"fixed","version":"36.0.7"},{"kind":"introduced","version":"37.0.0"},{"kind":"fixed","version":"42.0.2"},{"kind":"introduced","version":"43.0.0"},{"kind":"fixed","version":"43.0.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L","score":null,"severity":null}],"references":["https://crates.io/crates/wasmtime","https://rustsec.org/advisories/RUSTSEC-2026-0092.html","https://github.com/bytecodealliance/wasmtime/pull/13012"],"sourceUrl":"https://osv.dev/vulnerability/RUSTSEC-2026-0092","license":"OSV · upstream source license applies","key":"osv:RUSTSEC-2026-0092","identifiers":["RUSTSEC-2026-0092","CVE-2026-34942","GHSA-jxhv-7h78-9775"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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