CVE-2020-37280

HIGH 7.5

cbor-sync through 1.0.4 Memory Exhaustion via Unchecked CBOR Array Lengths

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-789
Vendor	pelioniot
Product	cbor-sync
Published	Oct 12, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

PelionIoT / cbor-sync

0 ≤ 1.0.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Mohammed Arfath A headlessme joszamama