{"schema_version":1,"title":"Bytecode Alliance Wasmtime-Wasi vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 5 vulnerabilities in Bytecode Alliance Wasmtime-Wasi: 0 in the last 7 days and 3 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, Wasmtime-WASI filesystem sandbox escape with symlink rename, was published on 14 October 2026. 1 vulnerability in the last four weeks, down 50% on the four before (2).","url":"https://junglewise.ai/threats/technologies/bytecode-alliance-wasmtime-wasi","json_url":"https://junglewise.ai/threats/technologies/bytecode-alliance-wasmtime-wasi.json","publisher":"Junglewise Threat Intelligence","license":"CC-BY-4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","attribution":"Junglewise Threat Intelligence, https://junglewise.ai/threats/technologies/bytecode-alliance-wasmtime-wasi","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"technology","thin":false,"counts":{"high":1,"all_time":5,"critical":0,"exploited":0,"last_7_days":0,"last_30_days":1,"last_90_days":3,"last_365_days":5},"latest":[{"cvss":4,"slug":"rustsec-2026-0352-filesystem-sandbox-escape-when-renaming-symlinks-with-86b22c86","title":"Wasmtime-WASI filesystem sandbox escape with symlink rename","severity":"medium","exploited":false,"published_at":"2026-10-14T12:00:00+00:00","url":"https://junglewise.ai/threats/rustsec-2026-0352-filesystem-sandbox-escape-when-renaming-symlinks-with-86b22c86"},{"cvss":4,"slug":"rustsec-2026-0322-excessive-allocated-memory-on-the-host-when-guests-84ef0787","title":"wasmtime-wasi excessive memory allocation when guests lack stdio","severity":"medium","exploited":false,"published_at":"2026-10-02T12:00:00+00:00","url":"https://junglewise.ai/threats/rustsec-2026-0322-excessive-allocated-memory-on-the-host-when-guests-84ef0787"},{"cvss":4,"slug":"rustsec-2026-0323-fd-readdir-copies-uninitialized-struct-padding-into-ed3c3a69","title":"Wasmtime wasmtime-wasi fd_readdir information disclosure","severity":"medium","exploited":false,"published_at":"2026-10-02T12:00:00+00:00","url":"https://junglewise.ai/threats/rustsec-2026-0323-fd-readdir-copies-uninitialized-struct-padding-into-ed3c3a69"},{"cve":"CVE-2026-54786","cvss":5,"epss":0.0037,"slug":"cve-2026-54786-bytecode-alliance-wasmtime-resource-leak-in-wasip1-fd-renumber","title":"Bytecode Alliance Wasmtime resource leak in WASIp1 fd_renumber","severity":"medium","exploited":false,"published_at":"2026-07-01T21:17:03.69+00:00","url":"https://junglewise.ai/threats/cve-2026-54786-bytecode-alliance-wasmtime-resource-leak-in-wasip1-fd-renumber"},{"cve":"CVE-2026-47261","cvss":7.5,"epss":0.005,"slug":"cve-2026-47261-bytecode-alliance-wasmtime-access-control-bypass-in-wasmtime-wasi","title":"Bytecode Alliance Wasmtime access control bypass in wasmtime-wasi","severity":"high","exploited":false,"published_at":"2026-06-15T21:17:11.153+00:00","url":"https://junglewise.ai/threats/cve-2026-47261-bytecode-alliance-wasmtime-access-control-bypass-in-wasmtime-wasi"}],"weekly":[{"week":"2026-08-17","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-24","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-31","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-07","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-14","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-21","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-28","critical":0,"exploited":0,"vulnerabilities":2},{"week":"2026-10-05","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-10-12","critical":0,"exploited":0,"vulnerabilities":1},{"week":"2026-10-19","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-10-26","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-11-02","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-11-09","critical":0,"exploited":0,"vulnerabilities":0}],"related":[{"name":"Bytecode Alliance Wasmtime","slug":"bytecode-alliance-wasmtime","vulnerabilities":55,"url":"https://junglewise.ai/threats/technologies/bytecode-alliance-wasmtime"}],"technology":{"hub":true,"name":"Bytecode Alliance Wasmtime-Wasi","slug":"bytecode-alliance-wasmtime-wasi","vendor":{"hub":true,"name":"Bytecode Alliance","slug":"bytecode-alliance","url":"https://junglewise.ai/threats/vendors/bytecode-alliance"},"aliases":[],"category":"library","repo_url":"https://github.com/bytecodealliance/wasmtime","description":"WebAssembly runtime component providing WASI (WebAssembly System Interface) functionality for wasmtime.","url":"https://junglewise.ai/threats/technologies/bytecode-alliance-wasmtime-wasi"},"most_severe":[{"cve":"CVE-2026-47261","cvss":7.5,"epss":0.005,"slug":"cve-2026-47261-bytecode-alliance-wasmtime-access-control-bypass-in-wasmtime-wasi","title":"Bytecode Alliance Wasmtime access control bypass in wasmtime-wasi","severity":"high","exploited":false,"published_at":"2026-06-15T21:17:11.153+00:00","url":"https://junglewise.ai/threats/cve-2026-47261-bytecode-alliance-wasmtime-access-control-bypass-in-wasmtime-wasi"},{"cve":"CVE-2026-54786","cvss":5,"epss":0.0037,"slug":"cve-2026-54786-bytecode-alliance-wasmtime-resource-leak-in-wasip1-fd-renumber","title":"Bytecode Alliance Wasmtime resource leak in WASIp1 fd_renumber","severity":"medium","exploited":false,"published_at":"2026-07-01T21:17:03.69+00:00","url":"https://junglewise.ai/threats/cve-2026-54786-bytecode-alliance-wasmtime-resource-leak-in-wasip1-fd-renumber"},{"cvss":4,"slug":"rustsec-2026-0352-filesystem-sandbox-escape-when-renaming-symlinks-with-86b22c86","title":"Wasmtime-WASI filesystem sandbox escape with symlink rename","severity":"medium","exploited":false,"published_at":"2026-10-14T12:00:00+00:00","url":"https://junglewise.ai/threats/rustsec-2026-0352-filesystem-sandbox-escape-when-renaming-symlinks-with-86b22c86"},{"cvss":4,"slug":"rustsec-2026-0322-excessive-allocated-memory-on-the-host-when-guests-84ef0787","title":"wasmtime-wasi excessive memory allocation when guests lack stdio","severity":"medium","exploited":false,"published_at":"2026-10-02T12:00:00+00:00","url":"https://junglewise.ai/threats/rustsec-2026-0322-excessive-allocated-memory-on-the-host-when-guests-84ef0787"},{"cvss":4,"slug":"rustsec-2026-0323-fd-readdir-copies-uninitialized-struct-padding-into-ed3c3a69","title":"Wasmtime wasmtime-wasi fd_readdir information disclosure","severity":"medium","exploited":false,"published_at":"2026-10-02T12:00:00+00:00","url":"https://junglewise.ai/threats/rustsec-2026-0323-fd-readdir-copies-uninitialized-struct-padding-into-ed3c3a69"}],"generated_at":"2026-11-09T03:07:00.176479+00:00"}