CVE-2026-104855

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Source

https://cve.org/CVERecord?id=CVE-2026-104855

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-104855.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-104855

Aliases

Published

2026-10-02T17:37:50Z

Modified

2026-10-03T03:47:03Z

Severity

2.0 (Low) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N CVSS Calculator

Summary

Wasmtime: Preemption and traps during bulk operations enable breaking internal VM state

Details

Wasmtime is a runtime for WebAssembly. From 46.0.0 until 46.0.2 and 47.0.3, fuel and epoch preemption checks inside bulk operations including memory.copy, table.grow, and array.copy can expose invalid intermediate state when an embedder mutates a Store in Store::epoch_deadline_callback or continues using a Store after cancellation or a trap. A cancelled non-nullable table growth can leave null elements, linear-memory growth during memory.copy can invalidate retained raw pointers, and callback-triggered garbage collection during array.copy can invalidate GC pointers, resulting in a crash, invalid memory access, or GC heap corruption. Embeddings whose callbacks only access the host data in Store, and embeddings that discard a Store after timeout or epoch deadline, are not affected. This issue is fixed in versions 46.0.2 and 47.0.3.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-362"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104855.json"
}

References

Affected packages

Git / github.com/bytecodealliance/wasmtime

Affected ranges

Type

GIT

Repo

https://github.com/bytecodealliance/wasmtime

Events

Introduced

423be7a4e4d30bb377c836d317521d1eb874e157

Fixed

4f87260abb0b64a6f0654a396551240edd270b71

Introduced

39d67168cdb6911ffdc961381314b6fed62e3c93

Fixed

5554cc1a651da536af2cc46c7324bdc085b162e3

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "46.0.0"
        },
        {
            "fixed":  "46.0.2"
        },
        {
            "introduced":  "47.0.0"
        },
        {
            "fixed":  "47.0.3"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Affected versions

v46.*

v46.0.0

v46.0.1

v47.*

v47.0.0

v47.0.1

v47.0.2

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-104855.json"