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EUVD-2026-349760

fkie_cve-2026-52878

Klever-Go is the Go implementation of the Klever blockchain protocol. Versions 1.7.14 through 1.7.17 are vulnerable to a nil-pointer panic triggered by a protobuf Transaction whose embedded RawData sub-message is omitted. This omission causes RawData to decode to nil. Every transaction gossiped on the Klever-Go P2P network is decoded and validated synchronously inside the libp2p pubsub topic-validator callback, where txVersionChecker.CheckTxVersion dereferences tx.RawData.Version with no nil check. Because the libp2p pubsub callback, the underlying go-libp2p-pubsub validation worker, and Klever's own network/p2p layer install no recover(), the panic propagates and crashes the entire node process. The attacker payload is a 3-byte protobuf message; no validator key, stake, funds, or on-chain account is required, and delivery aimed at enough of the BLS validator set can halt block production, resulting in a chain halt. This issue has been fixed in version 1.7.18.

GHSA-rm5c-5x2p-48wr — Klever-Go KVM: Unauthenticated remote node crash (nil-pointer DoS) in klever-go P2P transaction interceptor (txVersionC…

Affected: Go: github.com/klever-io/klever-go

## Summary Every transaction gossiped on the klever-go P2P network is decoded and validated synchronously inside the libp2p pubsub topic-validator callback. The validator `txVersionChecker.CheckTxVersion` dereferences `tx.RawData.Version` with no nil check. A protobuf `Transaction` whose embedded `RawData` sub-message is omitted decodes to `RawData == nil`, so validating it triggers a nil-pointer panic.

The libp2p pubsub callback, the underlying go-libp2p-pubsub validation worker, and klever's own `network/p2p` layer install no `recover()`, so the panic propagates and crashes the entire node process. The attacker payload is a 3-byte protobuf message; no validator key, stake, funds, or on-chain account is required. Aimed at enough of the BLS validator set, repeated delivery halts block production (chain halt).

## Affected component - Root cause: `core/versioning/txVersionChecker.go:22` - Reached via: `core/process/transaction/interceptedTransaction.go:203` (integrity) and `:154` (CheckValidity) - Production tx-topic path: `core/process/interceptors/multiDataInterceptor.go:171` and `:223` - Unprotected caller: `network/p2p/libp2p/netMessenger.go` `pubsubCallback` (no recover) - Topic wiring: `core/process/factory/interceptorscontainer/baseInterceptorsContainerFactory.go` (`createOneTxInterceptor`)

## Details Synchronous validation path, no recovery at any frame:

``` libp2p pubsubCallback network/p2p/libp2p/netMessenger.go (no recover) -> Mult…