CVE-2026-115384

Critical

Description

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.

SeverityCritical

CVSS9.9

Exploit probability—

ProductBytecodealliance Wasmtime

PublishedOct 22, 2026

First seenOct 22, 2026

Weakness typeCWE-20Improper input validation

How to fix

Update

bytecodealliance wasmtime48.0.4, 49.0.2 or later

Vendor advisories

github.com/bytecodealliance/wasmtime/security/advisories/GHSA-32h6-97mm-8q3c

Affected products

Product	Affected versions	Fixed in
bytecodealliance wasmtime	39.0.0 ≤ v < 48.0.4, 49.0.0 ≤ v < 49.0.2	48.0.4, 49.0.2

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