CVE-2026-115389: Allocation of Resources Without Limits or Throttling in bytecodealliance wasmtime
Description
CVE-2026-115389 is a resource allocation vulnerability in bytecodealliance's wasmtime affecting versions before 36.0.16, between 37.0.0 and before 48.0.3, and between 49.0.0 and before 49.0.1. The issue arises because wasmtime does not properly account for host memory allocations when lifting guest values via the Val API, allowing a malicious WebAssembly guest to allocate significantly more host memory than tracked. This can lead to denial of service due to resource exhaustion. The vulnerability has a low severity rating and no known exploits in the wild. No patch links are provided in the input data.
CVSS v4.0
Score 1.0low
Affected software
bytecodealliance
wasmtime
pkg:cargo/github/bytecodealliance/wasmtimeRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Wasmtime versions prior to 36.0.16, between 37.0.0 and 48.0.3, and between 49.0.0 and 49.0.1 do not correctly track host memory allocations when lifting guest values through the dynamically-typed Val API. This bypasses the hostcall fuel limit, enabling a malicious WebAssembly guest to return crafted values that allocate approximately 100 times more host memory than accounted for. This discrepancy can cause denial of service by exhausting host resources.
Potential Impact
The vulnerability allows a malicious WebAssembly guest to cause denial of service by allocating excessive host memory beyond the tracked limits. This can degrade or disrupt the availability of the affected system. There is no indication of confidentiality or integrity impact. No known exploits are reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is confirmed, consider restricting or sandboxing untrusted WebAssembly guests to limit potential resource abuse.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-22T11:27:18.001Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ada64a34d27ba8daa75657b
Added to database: 10/22/2026, 19:31:47 UTC
Last enriched: 10/22/2026, 20:31:02 UTC
Last updated: 10/22/2026, 21:15:19 UTC
Views: 9
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