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TI-2026-32195 Aliases CVE-2026-44216GHSA-p8xm-42r7-89xg

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

Priority LOW 26CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-770.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00319 25th percentileScored 2026-11-07
Fix Fixed wasmtime (bytecodealliance): 36.0.8, 43.0.2wasmtime (crates.io): 36.0.8, 43.0.2Red Hat: 1 advisory

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
bytecodealliancewasmtime30.0.0 to before 36.0.8; 37.0.0 to before 43.0.2; 44.0.036.0.8, 43.0.2Patch availableCNA
—wasmtime (crates.io)30.0.0 to before 36.0.836.0.8Patch availableGHSA-p8xm-42r7-89xg
—wasmtime (crates.io)37.0.0 to before 43.0.243.0.2Patch availableGHSA-p8xm-42r7-89xg
  • wasmtime Vendorbytecodealliance Affected 30.0.0 to before 36.0.8; 37.0.0 to before 43.0.2; 44.0.0 Fixed in 36.0.8, 43.0.2 Patch available CNA
  • wasmtime (crates.io) Vendor— Affected 30.0.0 to before 36.0.8 Fixed in 36.0.8 Patch available GHSA-p8xm-42r7-89xg
  • wasmtime (crates.io) Vendor— Affected 37.0.0 to before 43.0.2 Fixed in 43.0.2 Patch available GHSA-p8xm-42r7-89xg

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*30.0.0 to before 36.0.8; 37.0.0 to before 43.0.2Vulnerablebytecodealliance
cpe:2.3:a:bytecodealliance:wasmtime:44.0.0:*:*:*:*:rust:*:*44.0.0Vulnerablebytecodealliance
  • cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:* Versions 30.0.0 to before 36.0.8; 37.0.0 to before 43.0.2 Vulnerable ·bytecodealliance
  • cpe:2.3:a:bytecodealliance:wasmtime:44.0.0:*:*:*:*:rust:*:* Versions 44.0.0 Vulnerable ·bytecodealliance

Remediation

  • Fix · CNA wasmtime (bytecodealliance) Fixed in 36.0.8, 43.0.2
  • Fix · GHSA-p8xm-42r7-89xg wasmtime (crates.io) Fixed in 36.0.8 Advisory →
  • Fix · GHSA-p8xm-42r7-89xg wasmtime (crates.io) Fixed in 43.0.2 Advisory →

Red Hat 1 advisory

  • RHSA-2026:45341 Released 2026-07-24 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images cargo-1.97.1-2.hum1@aarch64, cargo-1.97.1-2.hum1@x86_64, clippy-1.97.1-2.hum1@aarch64 +36

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Hardened ImagesFixed RHSA-2026:45341
Not affected: 1 product
  • Red Hat Enterprise Linux 10

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-44216
  2. 2026-10-03 Alias added: GHSA-p8xm-42r7-89xg

References

Advisory 2

Other 2

  • TI-2026-21632 Wasmtime is vulnerable to panic when dropping a `[Typed]Func::call_async` future CVSS 4.0MEDIUM 6.9
  • TI-2023-11636 Guest-controlled out-of-bounds read/write on x86_64 in wasmtime CVSS 3.1CRITICAL 10.0
  • TI-2022-18765 Wasmtime vulnerable to data leakage between instances in the pooling allocator CVSS 3.1HIGH 8.6
  • TI-2022-08604 Use after free in Wasmtime CVSS 3.1CRITICAL 9.8
  • TI-2022-18766 wasmtime_trap_code C API function has out of bounds write vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2026-27209 Wasmtime with Winch compiler backend on aarch64 may allow a sandbox-escaping memory access CVSS 4.0CRITICAL 9.0
See all 40 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences