# Mcollina Msgpack5 vulnerabilities

Source: https://junglewise.ai/threats/technologies/mcollina-msgpack5  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/mcollina-msgpack5.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 6 vulnerabilities in Mcollina Msgpack5: 0 in the last 7 days and 6 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-107302, was published on 8 October 2026. Nothing in the last four weeks, down from 6 vulnerabilities in the four before.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 6
- All time: 6 (0 critical, 0 exploited in the wild)

## About Mcollina Msgpack5

Node.js library for encoding and decoding MessagePack binary format data.

## Latest Mcollina Msgpack5 vulnerabilities

- [CVE-2026-107302: msgpack5 out-of-bounds read in truncated map32 header](https://junglewise.ai/threats/cve-2026-107302-msgpack5-truncated-map32-headers-throw-an-unexpected-error) (high, CVSS 7.5, published 8 Oct 2026)
- [CVE-2026-107300: msgpack5 uncontrolled recursion in streaming decoder](https://junglewise.ai/threats/cve-2026-107300-msgpack5-many-buffered-values-can-exhaust-the-streaming-decoder) (high, CVSS 7.5, published 8 Oct 2026)
- [CVE-2026-107299: msgpack5 unbounded stream buffering via reserved byte](https://junglewise.ai/threats/cve-2026-107299-msgpack5-reserved-byte-can-cause-unbounded-stream-buffering) (medium, CVSS 5.9, published 8 Oct 2026)
- [CVE-2026-107301: msgpack5 prototype pollution via partial options](https://junglewise.ai/threats/cve-2026-107301-msgpack5-partial-options-disable-prototype-protection) (medium, CVSS 6.5, published 8 Oct 2026)
- [CVE-2026-107298: msgpack5 uncontrolled recursion in decoder](https://junglewise.ai/threats/cve-2026-107298-msgpack5-deeply-nested-input-can-exhaust-the-decoder-stack) (medium, CVSS 5.3, published 8 Oct 2026)
- [CVE-2026-107297: msgpack5 quadratic parsing in streaming decoder](https://junglewise.ai/threats/cve-2026-107297-msgpack5-quadratic-parsing-in-the-streaming-decoder) (medium, CVSS 5.9, published 8 Oct 2026)

## Most severe Mcollina Msgpack5 vulnerabilities

- [CVE-2026-107302: msgpack5 out-of-bounds read in truncated map32 header](https://junglewise.ai/threats/cve-2026-107302-msgpack5-truncated-map32-headers-throw-an-unexpected-error) (high, CVSS 7.5, published 8 Oct 2026)
- [CVE-2026-107300: msgpack5 uncontrolled recursion in streaming decoder](https://junglewise.ai/threats/cve-2026-107300-msgpack5-many-buffered-values-can-exhaust-the-streaming-decoder) (high, CVSS 7.5, published 8 Oct 2026)
- [CVE-2026-107301: msgpack5 prototype pollution via partial options](https://junglewise.ai/threats/cve-2026-107301-msgpack5-partial-options-disable-prototype-protection) (medium, CVSS 6.5, published 8 Oct 2026)
- [CVE-2026-107299: msgpack5 unbounded stream buffering via reserved byte](https://junglewise.ai/threats/cve-2026-107299-msgpack5-reserved-byte-can-cause-unbounded-stream-buffering) (medium, CVSS 5.9, published 8 Oct 2026)
- [CVE-2026-107297: msgpack5 quadratic parsing in streaming decoder](https://junglewise.ai/threats/cve-2026-107297-msgpack5-quadratic-parsing-in-the-streaming-decoder) (medium, CVSS 5.9, published 8 Oct 2026)
- [CVE-2026-107298: msgpack5 uncontrolled recursion in decoder](https://junglewise.ai/threats/cve-2026-107298-msgpack5-deeply-nested-input-can-exhaust-the-decoder-stack) (medium, CVSS 5.3, published 8 Oct 2026)

## Vulnerabilities per week

Nothing in the last four weeks, down from 6 vulnerabilities in the four before.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 6 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Mcollina Msgpack5 vulnerabilities", https://junglewise.ai/threats/technologies/mcollina-msgpack5, 9 November 2026.