CVE-2026-115384
criticalpriority · track · 40EPSS 0.003 · 24 %ileUSEPSS · scored 2026-10-28
Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a stack buffer overflow vulnerability that allows malicious guests to write ~16KB to the native stack via unvalidated async callback result types. Attackers can supply components with mistyped component-model-async callback functions to overwrite return addresses, crashing the host or escaping the sandbox.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.7–9.9
weaknesses
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affected products (2)
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advisories (1)
Vendor and ecosystem advisories describing this.
- RUSTSEC-2026-0327Wasmtime component async-lifted callback result count is unvalidated, causing a native stack buffer overflow2026-10-02vendor · osvUS
This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-32h6-97mm-8q3c For more information see the GitHub-hosted security advisory.
also known as (1)
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sources
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references (2) nvd
External citations — patches, advisories, analysis.
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