Vulnerability details
CVE-2026-115893
bytecodealliance wasmtime
Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction
CVSS 3.1
9.9Critical
Official description
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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.9Critical | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| bytecodealliance | wasmtime | < 36.0.19 | CVEProject cvelistV5 (CNA) |
| bytecodealliance | wasmtime | >= 37.0.0, < 48.0.7 | CVEProject cvelistV5 (CNA) |
| bytecodealliance | wasmtime | >= 49.0.0, < 49.0.4 | CVEProject cvelistV5 (CNA) |
References and advisories
12- 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
- https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7 x_refsource_MISC
- https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4 x_refsource_MISC
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Details
- Published
- 2026-10-24
- Last updated
- 2026-10-29
- State
- Published
- Assigner (CNA)
- GitHub_M
- Kolun priority
- 31 · Low
Exploit prediction (EPSS)
0.99%
Probability of exploitation in 30 days
62.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-691Insufficient Control Flow Management