Resource exhaustion in Bytecodealliance Wasmtime
CVE-2026-27204
Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of WASI host interfaces are susceptible to guest-controlled resource exhaustion on the host. Wasmtime did not ap…
Vulnerability class: DoS (Denial of Service)
EPSS: 0.003 (26.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Bytecodealliance Wasmtime — versions < 24.0.6, >= 25.0.0, < 36.0.6, >= 37.0.0, < 40.0.4
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Product, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-27204?
- CVE-2026-27204 is a medium-severity vulnerability in Bytecodealliance Wasmtime, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-02-24.
- How severe is CVE-2026-27204?
- Medium severity. CVSS v3 base score is 6.5 out of 10.