What’s Vulnerable › Vulnerabilities

CVE-2026-32284: Denial of service in github.com/shamaton/msgpack

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-26 · updated 2026-10-07
• Weakness: CWE-125

Description

The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack.

Affected products

• Shamaton Msgpack: through 3.1.2

References

• https://github.com/golang/vulndb/issues/4513
• https://github.com/shamaton/msgpack/issues/59
• https://pkg.go.dev/vuln/GO-2026-4513
• https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026

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