CVE-2026-115384 Wasmtime - Buffer Overflow

Wasmtime 39.0.0 < 48.0.4 and 49.0.0 < 49.0.2 contain a stack buffer overflow caused by unvalidated async callback result types in component-model-async callbacks, letting malicious guests overwrite return addresses to crash host or escape sandbox, exploit requires supplying mistyped async callbacks.

CVSS base score 9.9 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Denial Of Service, Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
22 October 2026
Updated
23 October 2026
Weakness
CWE-20

Vendor fix

Upgrade to versions 48.0.4 or later and 49.0.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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