# msgpack5 (npm) vulnerabilities Source: https://junglewise.ai/threats/technologies/msgpack5 Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/msgpack5.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 8 vulnerabilities in msgpack5 (npm): 0 in the last 7 days and 7 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 7 vulnerabilities in the four before. ## Counts - Last 7 days: 0 - Last 30 days: 0 - Last 90 days: 7 - All time: 8 (0 critical, 0 exploited in the wild) ## About msgpack5 (npm) JavaScript implementation of the MessagePack binary serialization format. ## Latest msgpack5 (npm) 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) - [CVE-2026-107296: msgpack5: Decoding negative int64 values mutates the input buffer](https://junglewise.ai/threats/cve-2026-107296-msgpack5-decoding-negative-int64-values-mutates-the-input-buffer) (low, CVSS 3.7, published 8 Oct 2026) - [CVE-2021-21368: msgpack5 prototype poisoning in map decoding](https://junglewise.ai/threats/cve-2021-21368-msgpack5-prototype-poisoning-in-map-decoding) (low, CVSS 3.1, published 12 Mar 2021) ## Most severe msgpack5 (npm) 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) - [CVE-2026-107296: msgpack5: Decoding negative int64 values mutates the input buffer](https://junglewise.ai/threats/cve-2026-107296-msgpack5-decoding-negative-int64-values-mutates-the-input-buffer) (low, CVSS 3.7, published 8 Oct 2026) - [CVE-2021-21368: msgpack5 prototype poisoning in map decoding](https://junglewise.ai/threats/cve-2021-21368-msgpack5-prototype-poisoning-in-map-decoding) (low, CVSS 3.1, published 12 Mar 2021) ## Vulnerabilities per week Nothing in the last four weeks, down from 7 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 | 7 | 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 | ## Other npm technologies - [openclaw (npm)](https://junglewise.ai/threats/technologies/npm-openclaw): 214 vulnerabilities - [flowise (npm)](https://junglewise.ai/threats/technologies/flowise): 133 vulnerabilities - [parse-server (npm)](https://junglewise.ai/threats/technologies/parse-server): 117 vulnerabilities - [vm2 (npm)](https://junglewise.ai/threats/technologies/vm2): 111 vulnerabilities - [electron (npm)](https://junglewise.ai/threats/technologies/electron): 77 vulnerabilities - [ghost (npm)](https://junglewise.ai/threats/technologies/ghost): 74 vulnerabilities - [n8n (npm)](https://junglewise.ai/threats/technologies/npm-n8n): 64 vulnerabilities - [hono (npm)](https://junglewise.ai/threats/technologies/hono): 62 vulnerabilities - [directus (npm)](https://junglewise.ai/threats/technologies/directus): 61 vulnerabilities - [nocodb (npm)](https://junglewise.ai/threats/technologies/nocodb): 54 vulnerabilities - [undici (npm)](https://junglewise.ai/threats/technologies/undici): 53 vulnerabilities - [@budibase/server (npm)](https://junglewise.ai/threats/technologies/budibase-server): 42 vulnerabilities ## 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, "msgpack5 (npm) vulnerabilities", https://junglewise.ai/threats/technologies/msgpack5, 13 November 2026.