CVE-2026-115381
mediumpriority · track · 19EPSS 0.002 · 11 %ileUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.1–5.9
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (3)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- RUSTSEC-2026-0322Excessive allocated memory on the host when guests don't have stdio2026-10-02vendor · osvUS
This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-gqmc-89g8-p25r For more information see the GitHub-hosted security advisory.
also known as (1)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (2) nvd
External citations — patches, advisories, analysis.
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