Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Denial of Service via Val API
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not adequately account for host allocations when lifting guest values through the dynamically-typed Val API, bypassing the hostcall fuel limit. A malicious WebAssembly guest can return crafted values that allocate at least ~100x more host memory than tracked, causing denial of service.
CVE-2026-115389
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-2026-115389
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": "36.0.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "36.0.16",
"versionType": "semver"
},
{
"status": "affected",
"version": "37.0.0",
"lessThan": "48.0.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "48.0.3",
"versionType": "semver"
},
{
"status": "affected",
"version": "49.0.0",
"lessThan": "49.0.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "49.0.1",
"versionType": "semver"
}
],
"packageURL": "pkg:cargo/wasmtime",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-115389
Source reference:
/cveMetadata/cveId
Publisher severity
low
Source reference: /containers/cna/metrics
- Event
- #52343 · Revision 1
- Added to Heist Feed
- Publisher date