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CVE-2026-107302— msgpack5: Truncated map32 headers throw an unexpected error

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 是用于 Node.js 和浏览器的 MessagePack v5 实现。在版本 6.1.0 之前，解码器在验证完整的五字节 map32 头是否可用之前，会先读取 map32 值的四字节长度字段。因此，若遇到截断的 map32 头，将导致受检的越界缓冲区读取，并抛出 RangeError 异常，而非 IncompleteBufferError 异常。对于在捕获 IncompleteBufferError 后会等待更多字节的应用程序而言，这种异常行为可能导致请求、流或工作进程意外终止。由于缓冲区实现本

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 1

VendorProduct Version RangeStatus
mcollina msgpack5 < 6.1.0 affected
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I. Basic Information for CVE-2026-107302

Vulnerability Information
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Vulnerability Title
msgpack5: Truncated map32 headers throw an unexpected error
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 decoder reads the four-byte length of a map32 value before validating that the complete five-byte header is available. A truncated map32 header therefore causes a checked out-of-bounds buffer read and throws RangeError instead of IncompleteBufferError, which can unexpectedly terminate a request, stream, or worker in applications that wait for additional bytes after IncompleteBufferError. There is no adjacent-memory disclosure because the buffer implementation checks bounds. 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:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
mcollina msgpack5 < 6.1.0 -

II. Public POCs for CVE-2026-107302

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III. Intelligence Information for CVE-2026-107302

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Patches & Fixes for CVE-2026-107302 (1)

Other References for CVE-2026-107302 (2)

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-2026-107301 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-2026-107298 5.3 MEDIUM msgpack5: Deeply nested input can exhaust the decoder stack
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-125

V. Comments for CVE-2026-107302

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