SB20260930114 - Multiple vulnerabilities in Wasmtime

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Main Vulnerability Database SB20260930114

SB20260930114 - Multiple vulnerabilities in Wasmtime

Published: September 30, 2026

Security Bulletin ID SB20260930114
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Integer overflow (CVE-ID: N/A)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


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

The vulnerability exists due to integer overflow in wasmtime-wasi filesystem timestamp handling when processing crafted filesystem timestamp values. A remote attacker can provide a timestamp whose microseconds field overflows its seconds field to cause a denial of service.

The issue affects the WASI Preview 1, Preview 2, and Preview 3 filesystem interfaces.


2) Allocation of Resources Without Limits or Throttling (CVE-ID: N/A)

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


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

The vulnerability exists due to failure to enforce write allowances in wasmtime-wasi-http outgoing HTTP body write handling when a guest supplies a buffer larger than the allowance returned by check-write. A remote attacker can invoke check-write and pass an oversized buffer to write to cause a denial of service.


3) Resource exhaustion (CVE-ID: N/A)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: 1 [CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:A/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 inadequate resource accounting in the dynamically typed Val API when loading a value returned by a guest. A remote user can return a value that causes excessive host memory allocations to cause a denial of service.

Only hosts using the Val API are affected; hosts using bindgen! or other statically typed APIs are unaffected.


4) Resource exhaustion (CVE-ID: N/A)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: 6.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


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

The vulnerability exists due to improper fuel accounting in the Cranelift backend when compiling guests containing `call_ref` callsites or calls within `try_table` catch paths. A remote user can execute a guest containing these opcodes to cause a denial of service.

Fuel consumption must be enabled, and user interaction is required.


Remediation

Install update from vendor's website.

References