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CVE-2026-107298— msgpack5: Deeply nested input can exhaust the decoder stack

Quick assessment

Affected
mcollina msgpack5
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.

msgpack5 是一个适用于 Node.js 和浏览器的 MessagePack v5 实现。在版本 6.1.0 之前，其数组和解码路径中的嵌套深度没有限制，攻击者若能提供 MessagePack 格式的输入数据，即可提交深层嵌套的容器结构，从而耗尽 JavaScript 调用栈，导致进程、工作线程或请求处理程序中断。该问题已在 6.1.0 版本中修复。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
mcollina msgpack5 < 6.1.0 affected
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I. Basic Information for CVE-2026-107298

Vulnerability Information
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Vulnerability Title
msgpack5: Deeply nested input can exhaust the decoder stack
Source: CVE Program / CVE List V5
Vulnerability Description
msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the array and map decoding paths have no nesting-depth limit, allowing an attacker who can provide MessagePack input to submit deeply nested containers that exhaust the JavaScript call stack and interrupt a process, worker, or request handler. This issue is fixed in version 6.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
mcollina msgpack5 < 6.1.0 -

II. Public POCs for CVE-2026-107298

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III. Intelligence Information for CVE-2026-107298

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Other References for CVE-2026-107298 (3)

Same Patch Batch · mcollina · 2026-10-08 · 7 CVEs total

CVE-2026-107300 7.5 HIGH msgpack5: Many buffered values can exhaust the streaming decoder stack
CVE-2026-107302 7.5 HIGH msgpack5: Truncated map32 headers throw an unexpected error
CVE-2026-107301 6.5 MEDIUM msgpack5: Partial options disable prototype protection
CVE-2026-107297 5.9 MEDIUM msgpack5: Quadratic parsing in the streaming decoder
CVE-2026-107299 5.9 MEDIUM msgpack5: Reserved byte can cause unbounded stream buffering
CVE-2026-107296 3.7 LOW msgpack5: Decoding negative int64 values mutates the input buffer

IV. Related Vulnerabilities

Same product: msgpack5
Same vendor: mcollina
Same weakness: CWE-674

V. Comments for CVE-2026-107298

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