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
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.
CVE-2026-115381
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-115381
wasmtime
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "bytecodealliance",
"product": "wasmtime",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "36.0.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "36.0.17",
"versionType": "semver"
},
{
"status": "affected",
"version": "37.0.0",
"lessThan": "48.0.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "48.0.4",
"versionType": "semver"
},
{
"status": "affected",
"version": "49.0.0",
"lessThan": "49.0.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "49.0.2",
"versionType": "semver"
}
],
"packageURL": "pkg:cargo/wasmtime-wasi",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-115381
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #52337 · Revision 1
- Added to Heist Feed
- Publisher date