{"id":"CVE-2026-115381","aliases":[],"cve":{"records":[{"id":"CVE-2026-115381","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-22T11:25:27.610Z","published":"2026-10-22T19:13:49.244Z","modified":"2026-10-26T19:38:29.893Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-10-22T19:13:49.244Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-26T19:38:29.893Z"}],"references":[{"url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-gqmc-89g8-p25r","tags":["vendor-advisory"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/wasmtime-before-36.0.17-37.0.0-before-48.0.4-and-49.0.0-before-49.0.2-unbounded-host-memory-allocation-via-sinkoutputstream-write-zeroes","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-770","description":"Allocation of Resources Without Limits or Throttling","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*","versionEndExcluding":"36.0.17"},{"vulnerable":true,"criteria":"cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*","versionStartIncluding":"37.0.0","versionEndExcluding":"48.0.4"},{"vulnerable":true,"criteria":"cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*","versionStartIncluding":"49.0.0","versionEndExcluding":"49.0.2"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-26T19:27:26.922435Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"partial"}]}]},"title":"Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Unbounded Host Memory Allocation via SinkOutputStream write-zeroes","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an unbounded memory allocation in the wasmtime-wasi WASIp2 write-zeroes method of SinkOutputStream, the default stream used when stdout/stderr are not configured. A malicious WebAssembly guest can request huge zero-filled writes, exhausting host memory and causing denial of service.","score":5.9,"severity":"medium","published":"2026-10-22T19:13:49.244Z","modified":"2026-10-26T19:38:29.893Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"bytecodealliance","name":"wasmtime","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"36.0.17","versionType":"semver"},{"version":"36.0.17","status":"unaffected","versionType":"semver"},{"version":"37.0.0","status":"affected","lessThan":"48.0.4","versionType":"semver"},{"version":"48.0.4","status":"unaffected","versionType":"semver"},{"version":"49.0.0","status":"affected","lessThan":"49.0.2","versionType":"semver"},{"version":"49.0.2","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:cargo/wasmtime-wasi","packageIdentity":{"ecosystem":"crates.io","name":"wasmtime-wasi"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-115381"}],"remediation":[],"references":["https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-gqmc-89g8-p25r","https://www.vulncheck.com/advisories/wasmtime-before-36.0.17-37.0.0-before-48.0.4-and-49.0.0-before-49.0.2-unbounded-host-memory-allocation-via-sinkoutputstream-write-zeroes"],"sources":[{"name":"CVE","id":"CVE-2026-115381","modified":"2026-10-26T19:38:29.893Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-115381"}],"assessments":[{"source":"VulnCheck","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:N","score":5.9},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H","score":4.8}],"sourceAffected":[],"observedAt":"2026-10-29T14:34:24.379Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T13:55:32.867Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":{"text":"Wasmtime versions before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 have an unbounded memory allocation weakness. A malicious WebAssembly guest can cause denial of service by exhausting host memory. The weakness is in the wasmtime-wasi SinkOutputStream write-zeroes method.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T08:51:21.688Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-115381"}]}}