CVE-2026-115386— Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Memory Disclosure via fd_readdir
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 在 36.0.17 之前、37.0.0 至 48.0.4 之前，以及 49.0.0 至 49.0.2 之前的版本中，WASIp1 的 实现存在信息泄露漏洞。该漏洞会将未初始化的结构体填充字节复制到 Guest（客户机）内存中。若 Guest 已预打开目录，则可通过列出目录条目，获取每个条目对应的三个字节残留主机栈或堆内存数据。
Affected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| bytecodealliance | wasmtime | < 36.0.17 |
affected |
36.0.17 |
unaffected | ||
37.0.0< 48.0.4 |
affected | ||
48.0.4 |
unaffected | ||
49.0.0< 49.0.2 |
affected | ||
49.0.2 |
unaffected |
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I. Basic Information for CVE-2026-115386
Vulnerability Information
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Vulnerability Title
Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Memory Disclosure via fd_readdir
Source: CVE Program / CVE List V5
Vulnerability Description
Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fd_readdir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of leftover host stack or heap memory per directory entry.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| bytecodealliance | wasmtime | 0 ~ 36.0.17 | - |
|
II. Public POCs for CVE-2026-115386
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-115386 (2)
Same Patch Batch · bytecodealliance · 2026-10-22 · 15 CVEs total
| CVE-2026-115384 | 9.9 CRITICAL | Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 Stack Buffer Overflow |
| CVE-2026-115392 | 7.9 HIGH | Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 before 46.0.3, and 47.0.0 before 47 |
| CVE-2026-115388 | 6.2 MEDIUM | Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Memory Exhaustion |
| CVE-2026-115385 | 6.2 MEDIUM | Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 Host Panic via WASIp3 Timestamps |
| CVE-2026-115387 | 6.2 MEDIUM | Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Host Panic via WAS |
| CVE-2026-115391 | 5.8 MEDIUM | Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 Unbounded Heap Allocation via WASIp |
| CVE-2026-115390 | 5.7 MEDIUM | Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 Fuel Accounting Bypass DoS |
| CVE-2026-115379 | 5.7 MEDIUM | Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 GC Heap Corruption via try_call |
| CVE-2026-115382 | 4.8 MEDIUM | Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 wasi:http Zero Timeout Panic DoS |
| CVE-2026-115381 | 4.8 MEDIUM | Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Unbounded Host Mem |
| CVE-2026-115383 | 4.8 MEDIUM | Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 GC Heap Corruption via Tag Imports |
| CVE-2026-115380 | 4.0 MEDIUM | Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Fuel Limit Bypass |
| CVE-2026-115393 | 3.8 LOW | Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47 |
| CVE-2026-115389 | 2.3 LOW | Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Denial of Service |
IV. Related Vulnerabilities
Same product: wasmtime
-
CVE-2026-115392
Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 befor -
CVE-2026-115393
Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 befor -
CVE-2026-115391
Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 Unbou -
CVE-2026-115390
Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 Fuel -
CVE-2026-115389
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 be
Same vendor: bytecodealliance
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CVE-2026-115392
Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 befor -
CVE-2026-115393
Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 befor -
CVE-2026-115391
Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 Unbou -
CVE-2026-115390
Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 Fuel -
CVE-2026-115389
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 be
Same weakness: CWE-908
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V. Comments for CVE-2026-115386
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