SB2026080123 - Heap-based buffer overflow in wasm-micro-runtime

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Main Vulnerability Database SB2026080123

SB2026080123 - Heap-based buffer overflow in wasm-micro-runtime

Published: August 1, 2026

Security Bulletin ID SB2026080123
CSH Severity
High
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Heap-based buffer overflow (CVE-ID: CVE-2026-54914)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 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


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.


Remediation

Install update from vendor's website.

References