Heap-based buffer overflow in wasm-micro-runtime - CVE-2026-54914
Published: August 1, 2026
Vulnerability identifier: #VU140705
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-54914
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Affected software:
wasm-micro-runtime
wasm-micro-runtime
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to a heap-based buffer overflow in wasmtime_ssp_poll_oneoff() when processing a crafted guest Wasm module that invokes WASI poll_oneoff with multiple subscriptions. A remote attacker can supply a crafted Wasm module to execute arbitrary code.
The issue can also cause a denial of service and breaks the runtime's sandbox isolation guarantee. WASI poll_oneoff is enabled by default, and no user interaction is required.
How to mitigate CVE-2026-54914
Install security update from vendor's website.