CVE-2026-115389 — LOW (2.3)

Vulnerability 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.

CVSS Score

2.3

LOW

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

Attack Vector

ADJACENT_NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

LOW

Related Weaknesses (CWE)

CWE-770

References

FAQ

What is CVE-2026-115389?

CVE-2026-115389 is a vulnerability with a CVSS score of 2.3 (LOW). 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 ...

How severe is CVE-2026-115389?

CVE-2026-115389 has been rated LOW with a CVSS base score of 2.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-115389?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.