CVE-2026-115893
CRITICALDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U
Exploit Intelligence
Moderate risk: more likely to be exploited than 62% of all known CVEs.
References
Related Vulnerabilities
Other CWE-691 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2021-0157 | Medium | 6.7 | 3.1% | - | - |
| CVE-2026-43503 | High | 7.0 | 2.0% | - | Fix |
| CVE-2022-20697 | High | 8.6 | 1.2% | - | - |
| CVE-2024-3847 | Medium | 6.1 | 0.9% | - | Fix |
| CVE-2023-5102 | Medium | 5.3 | 0.8% | - | Fix |
| CVE-2023-20559 | High | 8.8 | 0.7% | - | Fix |
Common questions
How do I fix CVE-2026-115893?
Upgrade wasmtime to 49.0.4 or later.
Is CVE-2026-115893 being actively exploited?
Not that we know of. CVE-2026-115893 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.99% is the estimated probability that it will be exploited in the next 30 days. That is higher than 62% of all scored CVEs.
How severe is CVE-2026-115893?
CVE-2026-115893 has a CVSS v3 base score of 9.9, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-115893 affect?
Published advisories record a fix for wasmtime (crates.io (Rust)). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-115893
Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-29.