High 7.5Published May 14, 2026

CVE-2026-44216Wasmtime is a runtime for WebAssembly.

Updated under an hour ago (2026-10-19 09:10 UTC)

Does this affect you?

It affects bytecodealliance wasmtime. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for bytecodealliance wasmtime

Exploited in the last 30 days

Wasmtime is a runtime for WebAssembly. From 30.0.0 to 36.0.8, 43.0.2, and 44.0.1, 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 vulnerability is fixed in 36.0.8, 43.0.2, and 44.0.1.

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-770, CWE-190
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jul 28, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

bytecodealliance wasmtime bytecodealliance:wasmtime	from 30.0.0 before 36.0.8; from 37.0.0 before 43.0.2; 44.0.0	NVD

References

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p8xm-42r7-89xgmitigation, vendor-advisory
https://access.redhat.com/errata/RHSA-2026:45341
https://access.redhat.com/security/cve/CVE-2026-44216
https://bugzilla.redhat.com/show_bug.cgi?id=2477467
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44216.json

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.