cve.bz

CVE-2026-115381

5.9 mediumEPSS 0.2%

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 4.0
5.9CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
4.8CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
EPSS
0.2% chance of exploitation in the next 30 days; higher than 11% of CVEs (scores of 2026-10-25)
CWE
CWE-770
Published
Modified
Record from
the NVD, synced

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
RUSTSEC-2026-0322crates.iowasmtime-wasi>=0.0.0-0 <36.0.17
>=37.0.0 <48.0.4
>=49.0.0 <49.0.2		36.0.17, 48.0.4, 49.0.2

References

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