cve.bz

CVE-2026-115389

1.0 lowEPSS 0.2%

Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not adequately account for host allocations when lifting guest values through the dynamically-typed Val API, bypassing the hostcall fuel limit. A malicious WebAssembly guest can return crafted values that allocate at least ~100x more host memory than tracked, causing denial of service.

CVSS 4.0
1.0CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
2.3CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
EPSS
0.2% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-10-25)
CWE
CWE-770
Published
Modified
Record from
the NVD, synced

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
RUSTSEC-2026-0316crates.iowasmtime>=0.0.0-0 <36.0.16
>=37.0.0 <48.0.3
>=49.0.0 <49.0.1		36.0.16, 48.0.3, 49.0.1

References

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