CVE-2026-115390

Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 Fuel Accounting Bypass DoS

State: Published
Severity: 6.9 Medium
Published: Oct 22, 2026
Updated: Oct 23, 2026
Reserved: Oct 22, 2026

Description

Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 contains a fuel accounting flaw in Cranelift-compiled call_ref and try_table catch paths. Malicious guests can reset consumed fuel after calls to run exponentially long on linear fuel, evading timeouts and periodic yields for denial of service.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	5.7 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
wasmtimebytecodealliance	47.0.0 to before 48.0.3Affected 48.0.3Not affected 49.0.0 to before 49.0.1Affected 49.0.1Not affected

References

GitHub Security Advisory (GHSA-m63x-6p34-q65x)vendor-advisory
VulnCheck Advisory: Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 Fuel Accounting Bypass DoSthird-party-advisory

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