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5.9 Medium

CVE-2026-115381 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…

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.

Affected products and versions

Product Affected versions Fixed in
wasmtime 49.0 49.0.0 → < 49.0.2 49.0.2
wasmtime 48.0 earliest → < 48.0.4 48.0.4
wasmtime 37.0 37.0.0 → < 48.0.4 48.0.4
wasmtime 36.0 earliest → < 36.0.17 36.0.17

Other CVEs of wasmtime

The 81 CVEs of wasmtime →
CVE-2026-121441 Wasmtime before 36.0.19, 37.0.0 before 48.0.7, and 49.0.0 before 49.0.4 contains a request smuggling vulnerability in… 6.3 Medium CVE-2026-121440 Wasmtime 46.0.0 before 48.0.7 and 49.0.0 before 49.0.4 fails to check forwarded trailers against the… 6.3 Medium CVE-2026-121439 Wasmtime 46.0.0 before 48.0.7 and 49.0.0 before 49.0.4 contains a response splitting vulnerability in wasi-http p3… 6.9 Medium CVE-2026-119143 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Panic via Zero-Length Stream Writes 5.9 Medium
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