Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 Unbounded Heap Allocation via WASIp3 Streams
Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 contains an uncontrolled resource allocation vulnerability in its WASIp3 implementation that buffers guest-specified-length writes on the host without limit. Malicious guests can offer large buffers to WASIp3 file or HTTP write streams, causing the host to copy and buffer all bytes, bounded only by guest linear memory, exhausting host memory.
CVE-2026-115391
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-2026-115391
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": "46.0.0",
"lessThan": "46.0.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "46.0.3",
"versionType": "semver"
},
{
"status": "affected",
"version": "47.0.0",
"lessThan": "47.0.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "47.0.4",
"versionType": "semver"
}
],
"packageURL": "pkg:cargo/wasmtime",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-115391
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #52344 · Revision 1
- Added to Heist Feed
- Publisher date