# msgpack5 (npm) vulnerabilities

8 known vulnerabilities (2 high, 5 medium, 1 low), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: not known (cve.now hasn't read this package's releases)
- Newest unaffected release: not known without release data
- Weekly downloads: 216.4K
- Dependents: 296
- Registry: https://www.npmjs.com/package/msgpack5

## Advisories (8)

### [CVE-2026-107302](https://cve.now/CVE-2026-107302): msgpack5: Truncated map32 headers throw an unexpected error

- Severity: High 7.5
- Published: Oct 8, 2026
- Affected: from 4.1.0, fixed in 6.1.0.

### [CVE-2026-107301](https://cve.now/CVE-2026-107301): msgpack5: Partial options disable prototype protection

- Severity: Medium 6.5
- Published: Oct 8, 2026
- Affected: fixed in 6.1.0.

### [CVE-2026-107300](https://cve.now/CVE-2026-107300): msgpack5: Many buffered values can exhaust the streaming decoder stack

- Severity: High 7.5
- Published: Oct 8, 2026
- Affected: fixed in 6.1.0.

### [CVE-2026-107299](https://cve.now/CVE-2026-107299): msgpack5: Reserved byte can cause unbounded stream buffering

- Severity: Medium 5.9
- Published: Oct 8, 2026
- Affected: fixed in 6.1.0.

### [CVE-2026-107298](https://cve.now/CVE-2026-107298): msgpack5: Deeply nested input can exhaust the decoder stack

- Severity: Medium 5.3
- Published: Oct 8, 2026
- Affected: fixed in 6.1.0.

### [CVE-2026-107297](https://cve.now/CVE-2026-107297): msgpack5: Quadratic parsing in the streaming decoder

- Severity: Medium 5.9
- Published: Oct 8, 2026
- Affected: fixed in 6.1.0.

### [CVE-2026-107296](https://cve.now/CVE-2026-107296): msgpack5: Decoding negative int64 values mutates the input buffer

- Severity: Low 3.7
- Published: Oct 8, 2026
- Affected: fixed in 6.1.0.

### [CVE-2021-21368](https://cve.now/CVE-2021-21368): Prototype poisoning

- Severity: Medium 6.7
- Published: Mar 12, 2021
- Affected: fixed in 3.6.1; from 4.0.0, fixed in 4.5.1; from 5.0.0, fixed in 5.2.1.

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