Medium 5.9Published May 14, 2026

CVE-2026-44216Wasmtime: Panic when allocating a table exceeding the size of the host's address space

Updated under an hour ago (Oct 27, 2026, 6:40 PM ET)

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It affects bytecodealliance wasmtime and 2 other products. Add what you run to find out whether that includes you.

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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: 5.9 MEDIUM (v4.0, CNA)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
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: GitHub_M
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 the name)	from 30.0.0, < 36.0.8; from 37.0.0, < 43.0.2; 44.0.0	CNA record
Red Hat Red Hat Hardened Images redhat:hummingbird	from 1.97.1-2.hum1 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	10	CISA ADP
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

References

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p8xm-42r7-89xg	x-refsource-confirm, mitigation, 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.