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CVE-2026-115893

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

CVSS score

9.9

EPSS probability

—

Risk score

1.0

Published

1 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

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Vulnerability description

DayBreach AI Explanation

Verified against sources

CVE-2026-115893: Wasmtime aarch64 Cranelift Compilation Flaw

Sources read

1

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

CVE-2026-115893 affects the Wasmtime WebAssembly runtime, specifically the aarch64 Cranelift compiler backend. It can compile large Wasm br_table instructions with incorrect branch targets, enabling sandbox escapes.

Why does it matter?

This critical vulnerability allows a user-controlled Wasm module to escape the sandbox and execute arbitrary code on affected aarch64 engines.

What should be done?

  • Update Wasmtime to versions 36.0.19, 48.0.7, or 49.0.4
  • Follow the vendor advisory for patch details
Chain of evidence and sources2 verified claims

Wasmtime içindeki aarch64 Cranelift arka ucu, br_table talimatlarında yanlış hedefler oluşturabilir.

S0 · daybreach-canonicalS1 · cvelist

Bu güvenlik açığı, kullanıcı kontrollü bir Wasm modülünün sandbox sınırından kaçmasına izin verebilir.

S0 · daybreach-canonicalS1 · cvelist
Show the technical text from the sources

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

CWE: CWE-691

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-115893 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1bytecodealliancewasmtime View
Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
9.9CVSS V31CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HNVD
9.9CVSS V3_1CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HCVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-115893 is associated with the following CWEs:

CWE-691: Common Weakness Enumeration Entry CWE-691

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-115893 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsLow
UserGerekmiyor

Official Sources and Advisories

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mghf-wjfp-p5xmvendor-advisoryhttps://github.com/bytecodealliance/wasmtime/pull/14818vendor-advisoryhttps://github.com/bytecodealliance/wasmtime/pull/14819vendor-advisoryhttps://github.com/bytecodealliance/wasmtime/pull/14820vendor-advisoryhttps://github.com/bytecodealliance/wasmtime/pull/14826vendor-advisoryhttps://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abdvendor-advisoryhttps://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618vendor-advisoryhttps://github.com/bytecodealliance/wasmtime/commit/e61df1b454be9313d61a5f8de07722a421139bbevendor-advisoryhttps://github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aavendor-advisoryhttps://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19vendor-advisory

CVSS Vector Radar Chart

9.9 / 10
Attack VectorNetworkComplexityLowPrivilegesLowUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow privileges
User InteractionNone required
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)None
Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

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Weakness Type (CWE & CAPEC)

CWE-691

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CVE-2026-115893 · Wasmtime: Cranelift backend on aarch64 can…