CVE-2026-115381

CVSS 5.9 (medium) · published 2026-10-22

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.

Weakness: CWE-770

Source: NVD CVE-2026-115381

References

• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-gqmc-89g8-p25r
• https://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

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