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
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.
CVE-2026-115388
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-2026-115388
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-wasi-http",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-115388
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #52342 · Revision 1
- Added to Heist Feed
- Publisher date