Critical 9.9Published Oct 23, 2026

CVE-2026-115893Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction

Updated under an hour ago (Oct 28, 2026, 5:50 AM ET)

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

EPSS puts the chance of exploitation in the next 30 days at 0.43%, higher than 37% of scored CVEs.

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Every CVE for bytecodealliance wasmtime

Exploited in the last 30 days

Wasmtime is a runtime for WebAssembly. Prior to 36.0.19, 48.0.7, and 49.0.4, the Cranelift compiler backend on aarch64 can compile a Wasm br_table instruction with more than approximately 256,000 targets so that it has an incorrect conditional branch target. The branch can then jump to arbitrary other code at a user-controlled offset, allowing a user-controlled Wasm module to escape the sandbox on aarch64 engines using the default Cranelift backend. This issue is fixed in versions 36.0.19, 48.0.7, and 49.0.4.

CVSS: 9.9 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-691
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.43% (percentile 37)
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 23, 2026
First seen by InfoSec Signals: Oct 23, 2026

Affected products

Affected products

bytecodealliance wasmtime bytecodealliance:wasmtime (from the name)	before 36.0.19; from 37.0.0, < 48.0.7; from 49.0.0, < 49.0.4	CNA record

References

References

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mghf-wjfp-p5xm	x-refsource-confirm
https://github.com/bytecodealliance/wasmtime/pull/14818	x-refsource-misc
https://github.com/bytecodealliance/wasmtime/pull/14819	x-refsource-misc
https://github.com/bytecodealliance/wasmtime/pull/14820	x-refsource-misc
https://github.com/bytecodealliance/wasmtime/pull/14826	x-refsource-misc
https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd	x-refsource-misc
https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618	x-refsource-misc
https://github.com/bytecodealliance/wasmtime/commit/e61df1b454be9313d61a5f8de07722a421139bbe	x-refsource-misc
https://github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa	x-refsource-misc
https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19	x-refsource-misc
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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.