CVE-2026-52878 - Klever-Go: Unauthenticated nil-pointer DoS in P2P transaction validation can halt the chain

CVE-2026-52878 - Klever-Go: Unauthenticated nil-pointer DoS in P2P transaction validation can halt the chain

https://cvefeed.io/rssfeed/latest.atom / Sat, 08/08/2026 - 04:10
CVE ID :CVE-2026-52878
Published : Aug. 7, 2026, 11:17 p.m. | 2 hours, 10 minutes ago
Description :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.
Severity: 7.5 | HIGH
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