CVE-2026-44216
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.
Does this matter?
Lower severity and a low EPSS score (0.32%). Track it; it rarely justifies an emergency change on its own.
Description
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 4.0
- 5.9 MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.32% probability · 25th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-770, CWE-190
- Affected
- bytecodealliance/wasmtime
- Source
- security-advisories@github.com
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.