GHSA-p8xm-42r7-89xg

Suggest an improvement
Source
https://github.com/advisories/GHSA-p8xm-42r7-89xg
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-p8xm-42r7-89xg/GHSA-p8xm-42r7-89xg.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-p8xm-42r7-89xg
Aliases
Related
Published
2026-05-07T00:08:59Z
Modified
2026-05-08T02:14:22.239421111Z
Severity
  • 5.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
wasmtime has a panic when allocating a table exceeding the size of the host's address space
Details

Impact

Wasmtime's allocation logic for a WebAssembly table contained checked arithmetic which panicked on overflow. This overflow is possible to trigger, and thus panic, when a table with an extremely large size is allocated. This is possible with the WebAssembly memory64 proposal where tables can have sizes in the 64-bit range as opposed to the previous 32-bit range which would not overflow. The panic happens when attempting to create a very large table, such as when instantiating a WebAssembly module or component.

This bug does not affect the pooling allocator which limits tables sizes to much less than the required amount to trigger the overflow. This bug is only present for the on-demand instance allocator, which is Wasmtime's default allocator. This bug also requires the memory64 WebAssembly feature to be enabled, which is on-by-default.

Panicking in the host process is considered a denial-of-service vector for Wasmtime.

Patches

Wasmtime 36.0.8, 43.0.2, and 44.0.1 have all been released which fixes this issue.

Workarounds

Embeddings can switch to using the pooling allocator to work around this issue, or the memory64 WebAssembly proposal can be disabled. Otherwise there is no workaround and users are recommended to upgrade.

Database specific 
{
    "nvd_published_at": null,
    "github_reviewed_at": "2026-05-07T00:08:59Z",
    "cwe_ids": [
        "CWE-770"
    ],
    "severity": "MODERATE",
    "github_reviewed": true
}
References

Affected packages

crates.io / wasmtime

Package

Name
wasmtime
View open source insights on deps.dev
Purl
pkg:cargo/wasmtime

Affected ranges

Type
SEMVER
Events
Introduced
30.0.0
Fixed
36.0.8

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-p8xm-42r7-89xg/GHSA-p8xm-42r7-89xg.json"

crates.io / wasmtime

Package

Name
wasmtime
View open source insights on deps.dev
Purl
pkg:cargo/wasmtime

Affected ranges

Type
SEMVER
Events
Introduced
37.0.0
Fixed
43.0.2

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-p8xm-42r7-89xg/GHSA-p8xm-42r7-89xg.json"