Nil-pointer Panic Vulnerability in Klever-Go by Klever
CVE-2026-52878

7.5HIGH

Key Information:

Vendor

Klever-io

Status
Klever-go
Vendor
CVE Published:
7 August 2026

What is CVE-2026-52878?

The Klever-Go implementation of the Klever blockchain protocol is susceptible to a nil-pointer panic that can be triggered by transactions with missing embedded RawData. This flaw allows attackers to send a minimal 3-byte protobuf message that, when processed, can cause the node to crash, halting block production within the network. The panic occurs during transaction validation in the libp2p pubsub topic-validator callback, where a dereference without proper nil checks leads to catastrophic failures in the node process. This deficiency places the integrity and continuity of the blockchain at risk, especially if enough nodes in the BLS validator set are targeted. Users are advised to upgrade to version 1.7.18 to mitigate this issue.

Affected Version(s)

klever-go >= 1.7.14, < 1.7.18

References

https://github.com/klever-io/klever-go/security/advisorie...
x_refsource_CONFIRM
https://github.com/klever-io/klever-go/releases/tag/v1.7.18
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.