What’s Vulnerable › Vulnerabilities

CVE-2020-37280: cbor-sync through 1.0.4 Memory Exhaustion via Unchecked CBOR Array Lengths

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-12 · updated 2026-10-16
• Weakness: CWE-789

Description

cbor-sync through 1.0.4 contains a resource exhaustion vulnerability in CBOR.decode that trusts declared array and map lengths without checking remaining input. Remote attackers can supply a tiny crafted CBOR payload declaring huge lengths to drive billions of iterations, exhausting CPU and process memory.

Affected products

• PelionIoT cbor-sync: through 1.0.4

References

• https://github.com/PelionIoT/cbor-sync
• https://github.com/PelionIoT/cbor-sync/issues/6
• https://github.com/PelionIoT/cbor-sync/pull/4
• https://www.vulncheck.com/advisories/cbor-sync-through-1.0.4-memory-exhaustion-via-unchecked-cbor-array-lengths

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