CVE-2026-115384

CVSS 9.9 (critical) · published 2026-10-22

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.

Weakness: CWE-20

Source: NVD CVE-2026-115384

References

• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-32h6-97mm-8q3c
• https://www.vulncheck.com/advisories/wasmtime-39.0.0-before-48.0.4-and-49.0.0-before-49.0.2-stack-buffer-overflow

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