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CVE-2026-115381medium5.9

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

Impact

Wasmtime versions before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 have an unbounded memory allocation weakness. A malicious WebAssembly guest can cause denial of service by exhausting host memory. The weakness is in the wasmtime-wasi SinkOutputStream write-zeroes method.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

bytecodealliance · VulnCheck

wasmtime

6 ranges
VulnCheck version evidence

Package identity

pkg:cargo/wasmtime-wasiExplore wasmtime-wasi →

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → before 36.0.17

semver versions

37.0.0 → before 48.0.4

semver versions

49.0.0 → before 49.0.2

semver versions

unaffected

36.0.17

semver versions

48.0.4

semver versions

49.0.2

semver versions

unknown

Other versions: unaffected

Original source description

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.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-115381

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-770 ↗

Allocation of Resources Without Limits or Throttling

VulnCheck

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

VulnCheck · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*

Before: 36.0.17

Vulnerable product

cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*

From (inclusive): 37.0.0

Before: 48.0.4

Vulnerable product

cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*

From (inclusive): 49.0.0

Before: 49.0.2

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "36.0.17"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "37.0.0",
            "versionEndExcluding": "48.0.4"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "49.0.0",
            "versionEndExcluding": "49.0.2"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
VulnCheck

Assigning organization

2026-10-22
CISA-ADP

Additional data publisher

2026-10-26

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.

References

2 sources
github.com/bytecodealliance/wasmtime/security/advisories/GHSA-gqmc-89g8-p25r
vendor-advisoryVulnCheck
www.vulncheck.com/advisories/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
third-party-advisoryVulnCheck