Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
bytecodealliance wasmtime
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Wasmtime 是一个 WebAssembly 运行时。在版本 36.0.19、48.0.7 和 49.0.4 之前，针对 aarch64 架构的 Cranelift 编译器后端在编译包含超过约 256,000 个目标的 Wasm 指令时，可能生成错误的条件分支目标。这会导致分支跳转到用户可控偏移处的任意代码，从而使用户控制的 Wasm 模块能够在默认使用 Cranelift 后端的 aarch64 引擎上突破沙箱隔离。该问题已在版本 36.0.19、48.0.7 和 49.0.4 中修复。

CVSS 9.9 · Critical
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-115893

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的控制流管理
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
bytecodealliance wasmtime < 36.0.19 -

II. Public POCs for CVE-2026-115893

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-115893

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-115893 (4)

Vendor Advisories for CVE-2026-115893 (1)

Vendor Pages for CVE-2026-115893 (3)

Same Patch Batch · bytecodealliance · 2026-10-23 · 3 CVEs total

CVE-2026-115889 9.9 CRITICAL Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilation
CVE-2026-115892 5.7 MEDIUM Wasmtime: Panic lowering a host-created component model stream into a guest that expects a

IV. Related Vulnerabilities

Same product: wasmtime
Same vendor: bytecodealliance
Same weakness: CWE-691

V. Comments for CVE-2026-115893

No comments yet

Leave a comment