SB2026080104 - Missing Release of Resource after Effective Lifetime in Wasmtime

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Main Vulnerability Database SB2026080104

SB2026080104 - Missing Release of Resource after Effective Lifetime in Wasmtime

Published: August 1, 2026

Security Bulletin ID SB2026080104
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-54786)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to improper resource shutdown in WASIp1 `fd_renumber` implementation when renumbering file descriptors. A remote user can repeatedly invoke `fd_renumber` after obtaining file descriptors to cause a denial of service.

Only the native WASIp1 implementation is affected, and exploitation requires a runtime that exposes `fd_renumber` and allows acquisition of file descriptors such as by opening files.


Remediation

Install update from vendor's website.

References