Wasmtime: Panic when allocating a table exceeding the size of the host's address space (bytecodealliance wasmtime)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.32 % · percentile 25 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Modified
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.
Weaknesses (CWE)
- CWE-770 — Allocation of Resources Without Limits or Throttling
- CWE-190 — Integer Overflow or Wraparound
References
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p8xm-42r7-89xg
- 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
- https://access.redhat.com/errata/RHSA-2026:45341
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 4.0 | MEDIUM 5.9 | 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 | GitHub_M |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat-SADP |
| CVSS 4.0 | MEDIUM 5.9 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD · security-advisories@github.com (Secondary) |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary) |
European references
- ENISA EUVD · EUVD-2026-30304
- GCVE · GCVE-0-2026-44216
Affected configurations (NVD CPE)
cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*≥ 30.0.0 < 36.0.8cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*≥ 37.0.0 < 43.0.2cpe:2.3:a:bytecodealliance:wasmtime:44.0.0:*:*:*:*:rust:*:*
Affected products
| Product | Versions |
|---|---|
| bytecodealliance · wasmtime | affected >= 30.0.0, < 36.0.8 ; affected >= 37.0.0, < 43.0.2 ; affected 44.0.0 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |