CVE-2026-115389

low

Description

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.

References

https://www.vulncheck.com/advisories/wasmtime-before-36.0.16-37.0.0-before-48.0.3-and-49.0.0-before-49.0.1-denial-of-service-via-val-api

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-jqpg-j7w6-42pr

Details

Source: Mitre, NVD

Published: 2026-10-22

Updated: 2026-10-22

Risk Information

CVSS v2

Base Score: 1.4

Vector: CVSS2#AV:A/AC:H/Au:S/C:N/I:N/A:P

Severity: Low

CVSS v3

Base Score: 2.3

Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L

Severity: Low

CVSS v4

Base Score: 1

Vector: CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Severity: Low