CVE-2026-119134

Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 Unbounded Memory Growth via Component-Model Resource Handles

State: Published
Severity: 6.9 Medium
Published: Oct 29, 2026
Updated: Oct 29, 2026
Reserved: Oct 29, 2026

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Description

Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 caps component-model resource handle tables only per component instance and does not charge handle allocations to any ResourceLimiter or StoreLimits. A malicious guest can repeatedly call resource.new and instantiate sub-components to exceed the per-instance cap many times over, causing unbounded host memory growth.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	6.2 Medium	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
wasmtimebytecodealliance	before 36.0.18Affected 36.0.18Not affected 37.0.0 to before 48.0.6Affected 48.0.6Not affected 49.0.0 to before 49.0.3Affected 49.0.3Not affected

References

GitHub Security Advisory (GHSA-q554-3cjc-rx7p)vendor-advisory
VulnCheck Advisory: Wasmtime before 36.0.18, 37.0.0 before 48.0.6, and 49.0.0 before 49.0.3 Unbounded Memory Growth via Component-Model Resource Handlesthird-party-advisory

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