CVE-2026-115388— Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Memory Exhaustion DoS via wasmtime-wasi-http Outgoing Body Write
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.
在 Wasmtime 36.0.16 之前、37.0.0 至 48.0.3 之间、以及 49.0.0 至 49.0.1 之前的版本中， 组件未对 WASIp2 的出站 HTTP 请求体强制执行 的 权限检查。这导致超出限制的大规模写入操作不会触发异常（trap），而是成功执行。恶意 Guest（客户端）可向出站请求体资源传入超大缓冲区进行写入，从而在 Store 的整个生命周期内占用 Host 的内存分配，最终耗尽 Host 的内存资源。
Possible ATT&CK Techniques 1 AI
T1499.003 · Application Exhaustion FloodAffected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| bytecodealliance | wasmtime | < 36.0.16 |
affected |
36.0.16 |
unaffected | ||
37.0.0< 48.0.3 |
affected | ||
48.0.3 |
unaffected | ||
49.0.0< 49.0.1 |
affected | ||
49.0.1 |
unaffected |
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I. Basic Information for CVE-2026-115388
Vulnerability Information
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Vulnerability Title
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 Memory Exhaustion DoS via wasmtime-wasi-http Outgoing Body Write
Source: CVE Program / CVE List V5
Vulnerability Description
wasmtime-wasi-http in Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not enforce the wasi:io/streams check-write allowance for WASIp2 outgoing HTTP bodies, so oversized writes succeed instead of trapping. A malicious guest can pass large buffers to write on outgoing-body resources, holding host allocations for the store's lifetime and exhausting host memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| bytecodealliance | wasmtime | 0 ~ 36.0.16 | - |
|
II. Public POCs for CVE-2026-115388
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-115388 (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-2026-115385 | 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-2026-115386 | 2.6 LOW | Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Memory Disclosure |
| 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
-
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-400
-
CVE-2026-115390
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Mistune before 3.3.0 Quadratic-Time DoS via parse_link_text -
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PhpSpreadsheet ODS Reader: Unbounded number-rows-repeated → -
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V. Comments for CVE-2026-115388
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