CVE-2026-32284

Summary

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 Software

Weaknesses

• CWE-125: Out-of-bounds Read

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

Additional References

• https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026

References

• https://github.com/shamaton/msgpack/issues/59
• https://github.com/golang/vulndb/issues/4513
• https://pkg.go.dev/vuln/GO-2026-4513

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