{"id":"GHSA-xm67-587q-r2vw","revision":null,"records":[{"revision":"0c91c0f4d34b44d8b05896e626e75c5b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2023-27477","aliases":[],"title":"wasmtime is a fast and secure runtime for WebAssembly. Wasmtime's code generation backend, Cranelift, has a bug on x86_64 platforms for the WebAssembly `i8x16.select` instruction which will produce the wrong results when the same operand is…","description":"wasmtime is a fast and secure runtime for WebAssembly. Wasmtime's code generation backend, Cranelift, has a bug on x86_64 platforms for the WebAssembly `i8x16.select` instruction which will produce the wrong results when the same operand is provided to the instruction and some of the selected indices are greater than 16. There is an off-by-one error in the calculation of the mask to the `pshufb` instruction which causes incorrect results to be returned if lanes are selected from the second vector. This codegen bug has been fixed in Wasmtiem 6.0.1, 5.0.1, and 4.0.1. Users are recommended to upgrade to these updated versions. If upgrading is not an option for you at this time, you can avoid this miscompilation by disabling the Wasm simd proposal. Additionally the bug is only present on x86_64 hosts. Other platforms such as AArch64 and s390x are not affected.","state":0,"publishedAt":"2023-03-08T00:00:00+00:00","modifiedAt":"2025-02-25T14:59:59.689+00:00","affected":[{"ecosystem":"Vendor product","name":"wasmtime","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"bytecodealliance\",\n                    \"product\": \"wasmtime\",\n                    \"versions\": [\n                        {\n                            \"version\": \"cranelift-codegen: >= 0.88.0, < 0.91.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"cranelift-codegen: >= 0.92.0, < 0.92.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"cranelift-codegen: >= 0.93.0, < 0.93.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \" wasmtime: >= 0.37.0, < 4.0.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \" wasmtime: >= 5.0.0, < 5.0.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \" wasmtime: >= 6.0.0, < 6.0.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N","score":3.1,"severity":"LOW"}],"references":["https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.wasm_simd","https://github.com/webassembly/simd","https://groups.google.com/a/bytecodealliance.org/g/sec-announce/c/Mov-ItrNJsQ","https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vw","https://github.com/bytecodealliance/wasmtime/commit/5dc2bbccbb363e474d2c9a1b8e38a89a43bbd5d1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-27477","license":"CVE Program Terms of Use","key":"cve-program:CVE-2023-27477","identifiers":["CVE-2023-27477"]},"retained":false,"historicalAffected":[]},{"revision":"05a9a16bda1848b4a89dacfa5c1b5eb5","observedAt":"2026-11-10T01:22:39.133+00:00","statement":{"source":"euvd","id":"EUVD-2023-1143","aliases":["CVE-2023-27477","GHSA-xm67-587q-r2vw"],"title":"wasmtime is a fast and secure runtime for WebAssembly. Wasmtime's code generation backend, Cranelift, has a bug on x86_64 platforms for the WebAssembly `i8x16.select` instruction which will produce the wrong results when the same operand is…","description":"wasmtime is a fast and secure runtime for WebAssembly. Wasmtime's code generation backend, Cranelift, has a bug on x86_64 platforms for the WebAssembly `i8x16.select` instruction which will produce the wrong results when the same operand is provided to the instruction and some of the selected indices are greater than 16. There is an off-by-one error in the calculation of the mask to the `pshufb` instruction which causes incorrect results to be returned if lanes are selected from the second vector. This codegen bug has been fixed in Wasmtiem 6.0.1, 5.0.1, and 4.0.1. Users are recommended to upgrade to these updated versions. If upgrading is not an option for you at this time, you can avoid this miscompilation by disabling the Wasm simd proposal. Additionally the bug is only present on x86_64 hosts. Other platforms such as AArch64 and s390x are not affected.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N","score":3.1,"severity":null}],"references":["https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.wasm_simd","https://github.com/webassembly/simd","https://groups.google.com/a/bytecodealliance.org/g/sec-announce/c/Mov-ItrNJsQ","https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vw","https://github.com/bytecodealliance/wasmtime/commit/5dc2bbccbb363e474d2c9a1b8e38a89a43bbd5d1"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2023-1143","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Mar 8, 2023, 12:00:00 AM","dateUpdated":"Feb 25, 2025, 2:59:59 PM"},"relatedAdvisories":[{"id":"msrc_CVE-2023-27477","title":"wasmtime is a fast and secure runtime for WebAssembly. Wasmtime's code generation backend Cranelift has a bug on x86_64 platforms for the WebAssembly `i8x16.select` instruction which will produce the wrong results when the same operand is provided to the instruction and some of the selected indices are greater than 16. There is an off-by-one error in the calculation of the mask to the `pshufb` instruction which causes incorrect results to be returned if lanes are selected from the second vector. This codegen bug has been fixed in Wasmtiem 6.0.1 5.0.1 and 4.0.1. Users are recommended to upgrade to these updated versions. If upgrading is not an option for you at this time you can avoid this miscompilation by disabling the Wasm simd proposal. Additionally the bug is only present on x86_64 hosts. Other platforms such as AArch64 and s390x are not affected.","vulnerabilityIds":["CVE-2023-27477"]}],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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-2023-1143","identifiers":["EUVD-2023-1143","CVE-2023-27477","GHSA-xm67-587q-r2vw"]},"retained":false,"historicalAffected":[]},{"revision":"2165908a1d9a450081ba419f0b15a717","observedAt":"2026-10-24T21:17:34.442+00:00","statement":{"source":"nvd","id":"CVE-2023-27477","aliases":[],"title":"wasmtime is a fast and secure runtime for WebAssembly. Wasmtime's code generation backend, Cranelift, has a bug on x86_64 platforms for the WebAssembly `i8x16.select` instruction which will produce the wrong results when the same operand is…","description":"wasmtime is a fast and secure runtime for WebAssembly. Wasmtime's code generation backend, Cranelift, has a bug on x86_64 platforms for the WebAssembly `i8x16.select` instruction which will produce the wrong results when the same operand is provided to the instruction and some of the selected indices are greater than 16. There is an off-by-one error in the calculation of the mask to the `pshufb` instruction which causes incorrect results to be returned if lanes are selected from the second vector. This codegen bug has been fixed in Wasmtiem 6.0.1, 5.0.1, and 4.0.1. Users are recommended to upgrade to these updated versions. If upgrading is not an option for you at this time, you can avoid this miscompilation by disabling the Wasm simd proposal. Additionally the bug is only present on x86_64 hosts. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2023-27477","identifiers":["CVE-2023-27477"]},"retained":false,"historicalAffected":[]},{"revision":"6f37d044120d4fa9b0825768b8da39ad","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"GHSA-xm67-587q-r2vw","aliases":["CVE-2023-27477","RUSTSEC-2023-0093"],"title":"wasmtime vulnerable to miscompilation of `i8x16.select` with the same inputs on x86_64","description":"### Impact\n\nWasmtime's code generation backend, Cranelift, has a bug on x86_64 platforms for the WebAssembly `i8x16.select` instruction which will produce the wrong results when the same operand is provided to the instruction and some of the selected indices are greater than 16. There is an off-by-one error  in the calculation of the mask to the `pshufb` instruction which causes incorrect results to be returned if lanes are selected from the second vector.\n\nThe impact of this miscompilation is that the WebAssembly instruction can produce incorrect results for the `i8x16.select` instruction. This should have no effect on embedders and does not represent a sandbox escape, for example. Guest programs, however, may behave unexpectedly due to the incorrect result of this instruction. In extreme cases if a guest program is handling untrusted input then the guest program may deviate from its intended execution, for example calling an imported host function with different arguments than intended. This still does not impact embedders, however, because there is no form of privilege escalation with the guest.\n\nAt this time it's expected that this codegen pattern doesn't show up in the wild that often. LLVM-generated modules, for example, do not appear to conventionally or idiomatically generate code which would hit this bug. It is possible, however, to still write code which triggers this, so it's recommended for embedders to analyze existing modules to see if any are affected.\n\n### Patches\n\nThis codegen bug has been fixed in Wasmtime 6.0.1, 5.0.1, and 4.0.1. Users are recommended to upgrade to these updated versions.\n\n### Workarounds\n\nIf upgrading is not an option for you at this time, you can avoid this miscompilation by [disabling the Wasm simd proposal](https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.wasm_simd)\n\n```rust\nconfig.wasm_simd(false);\n```\n\nAdditionally the bug is only present on x86_64 hosts. Other platforms such as AArch64 and s390x are not affected.\n\n### References\n\n* [The WebAssembly simd proposal](https://github.com/webassembly/simd)\n* [Mailing list announcement](https://groups.google.com/a/bytecodealliance.org/g/sec-announce/c/Mov-ItrNJsQ)\n* [GitHub advisory](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vw)\n* [Commit to fix this issue on Wasmtime's `main` branch](https://github.com/bytecodealliance/wasmtime/commit/5dc2bbccbb363e474d2c9a1b8e38a89a43bbd5d1)\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n* Reach out to us on [the Bytecode Alliance Zulip chat](https://bytecodealliance.zulipchat.com/#narrow/stream/217126-wasmtime)\n* Open an issue in [the bytecodealliance/wasmtime repository](https://github.com/bytecodealliance/wasmtime/)","state":0,"publishedAt":"2023-03-09T00:09:03+00:00","modifiedAt":"2026-09-10T03:49:53.157591+00:00","affected":[{"ecosystem":"crates.io","name":"wasmtime","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.0.0"},{"kind":"fixed","version":"4.0.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"crates.io","name":"wasmtime","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"5.0.0"},{"kind":"fixed","version":"5.0.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"crates.io","name":"wasmtime","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"6.0.0"},{"kind":"fixed","version":"6.0.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"crates.io","name":"cranelift-codegen","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.88.0"},{"kind":"fixed","version":"0.91.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"crates.io","name":"cranelift-codegen","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.92.0"},{"kind":"fixed","version":"0.92.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"crates.io","name":"cranelift-codegen","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.93.0"},{"kind":"fixed","version":"0.93.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"LOW"}],"references":["https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vw","https://nvd.nist.gov/vuln/detail/CVE-2023-27477","https://github.com/bytecodealliance/wasmtime/commit/5dc2bbccbb363e474d2c9a1b8e38a89a43bbd5d1","https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.wasm_simd","https://github.com/bytecodealliance/wasmtime","https://github.com/webassembly/simd","https://groups.google.com/a/bytecodealliance.org/g/sec-announce/c/Mov-ItrNJsQ","https://rustsec.org/advisories/RUSTSEC-2023-0093.html"],"sourceUrl":"https://github.com/advisories/GHSA-xm67-587q-r2vw","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-xm67-587q-r2vw","identifiers":["GHSA-xm67-587q-r2vw","CVE-2023-27477","RUSTSEC-2023-0093"]},"retained":false,"historicalAffected":[]},{"revision":"c1fb5e29492c4205a9635dd94f6915e1","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"RUSTSEC-2023-0093","aliases":["CVE-2023-27477","GHSA-xm67-587q-r2vw"],"title":"Miscompilation of `i8x16.select` with the same inputs on x86\\_64","description":"This is an entry in the RustSec database for the Wasmtime security advisory\nlocated at\nhttps://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vw.\nFor more information see the GitHub-hosted security advisory.","state":0,"publishedAt":"2023-03-03T12:00:00+00:00","modifiedAt":"2026-10-12T18:00:06.812157+00:00","affected":[{"ecosystem":"crates.io","name":"wasmtime","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.0.0-0"},{"kind":"fixed","version":"4.0.1"},{"kind":"introduced","version":"5.0.0"},{"kind":"fixed","version":"5.0.1"},{"kind":"introduced","version":"6.0.0"},{"kind":"fixed","version":"6.0.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N","score":null,"severity":null}],"references":["https://crates.io/crates/wasmtime","https://rustsec.org/advisories/RUSTSEC-2023-0093.html","https://github.com/bytecodealliance/wasmtime/commit/5dc2bbccbb363e474d2c9a1b8e38a89a43bbd5d1"],"sourceUrl":"https://osv.dev/vulnerability/RUSTSEC-2023-0093","license":"OSV · upstream source license applies","key":"osv:RUSTSEC-2023-0093","identifiers":["RUSTSEC-2023-0093","CVE-2023-27477","GHSA-xm67-587q-r2vw"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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