{"schema":"threatline.record/2","record":{"id":"CVE-2026-115388","aliases":["GHSA-c9gc-w9vx-w86p"],"summary":"Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Memory Exhaustion DoS via wasmtime-wasi-http Outgoing Body Write","details":"wasmtime-wasi-http in Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not enforce the wasi:io/streams check-write allowance for WASIp2 outgoing HTTP bodies, so oversized writes succeed instead of trapping. A malicious guest can pass large buffers to write on outgoing-body resources, holding host allocations for the store's lifetime and exhausting host memory.","categories":["Unclassified"],"product":"wasmtime","vendor":"bytecodealliance","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115388","source_modified_at":"2026-10-22T19:13:54.430Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"wasmtime","vendor":"bytecodealliance","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"36.0.16"},{"version":"36.0.16","status":"unaffected","versionType":"semver"},{"version":"37.0.0","status":"affected","versionType":"semver","lessThan":"48.0.3"},{"version":"48.0.3","status":"unaffected","versionType":"semver"},{"version":"49.0.0","status":"affected","versionType":"semver","lessThan":"49.0.1"},{"version":"49.0.1","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"GitHub Advisory Database","source_url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-c9gc-w9vx-w86p","source_modified_at":"2026-10-23T18:32:33Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"rust","name":"wasmtime-wasi-http"},"range":"< 36.0.16, >= 37.0.0, >= 47.0.0, < 48.0.3, 49.0.0"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115388","source_modified_at":"2026-10-22T19:13:54.430Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"wasmtime","ecosystem":null},"version":"36.0.16","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115388","source_modified_at":"2026-10-22T19:13:54.430Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"wasmtime","ecosystem":null},"version":"48.0.3","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115388","source_modified_at":"2026-10-22T19:13:54.430Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"wasmtime","ecosystem":null},"version":"49.0.1","basis":"first unaffected version stated in the CVE record"},{"source":"GitHub Advisory Database","source_url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-c9gc-w9vx-w86p","source_modified_at":"2026-10-23T18:32:33Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"rust","name":"wasmtime-wasi-http"},"version":"36.0.16"},{"source":"GitHub Advisory Database","source_url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-c9gc-w9vx-w86p","source_modified_at":"2026-10-23T18:32:33Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"rust","name":"wasmtime-wasi-http"},"version":"48.0.3"},{"source":"GitHub Advisory Database","source_url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-c9gc-w9vx-w86p","source_modified_at":"2026-10-23T18:32:33Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"rust","name":"wasmtime-wasi-http"},"version":"49.0.1"}],"cvss":6.9,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00112,"percentile":0.01327,"score_date":"2026-10-23"},"published_at":"2026-10-22T19:13:54.430Z","modified_at":"2026-10-23T18:32:33Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-115388","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-22T19:13:54.430Z"},{"source":"GitHub Advisory Database","url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-c9gc-w9vx-w86p","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T18:32:33Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-115388","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","GitHub Advisory Database","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-c9gc-w9vx-w86p","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/wasmtime-before-36.0.16-37.0.0-before-48.0.3-and-49.0.0-before-49.0.1-memory-exhaustion-dos-via-wasmtime-wasi-http-outgoing-body-write","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-23T18:32:33Z","content_hash":"4ad6c240bf3168b7865a5c32d652f562ada7e9ced22dc24f08e3cb4fc738c009"}}