---
cve: "CVE-2026-115893"
severity: "CRITICAL"
cvss: 9.9
epss: "0.4%"
vendor: "bytecodealliance"
kev: false
exploited: false
published: "2026-10-23 21:29:33"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-28T23:03:46+01:00"
---

# CVE-2026-115893

> 9.9 CRITICAL · 🧪 PoC

## Beschreibung

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.

## CNA-Record (Kanon, cvelistV5)

- CNA: **GitHub_M**
- State: PUBLISHED
- Stand: 2026-10-23 21:29:33
- CNA-CVSS: **9.9** (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`)

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Schwachstellen-Klasse

- **CWE-691** — Insufficient Control Flow Management
  The code does not sufficiently manage its control flow during execution, creating conditions in which the control flow can be modified in unexpected ways.

## Angriffsmuster (CAPEC)

- [CAPEC-29 — Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions](https://capec.mitre.org/data/definitions/29.html) _(Severity: High)_

## Patch verfügbar (OSV)

- 0d6b8ead4e94b0ce76f925611b831b56570aef94 (Commit)
- c6846e13f64b07b7912d372db141397058b55f99 (Commit)

## Referenzen

- <https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mghf-wjfp-p5xm>
- <https://github.com/bytecodealliance/wasmtime/pull/14818>
- <https://github.com/bytecodealliance/wasmtime/pull/14819>
- <https://github.com/bytecodealliance/wasmtime/pull/14820>
- <https://github.com/bytecodealliance/wasmtime/pull/14826>
- <https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd>
- <https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618>
- <https://github.com/bytecodealliance/wasmtime/commit/e61df1b454be9313d61a5f8de07722a421139bbe>
- <https://github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa>
- <https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19>
- <https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7>
- <https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-115893/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_