Vulnerability Description
Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.18, the P2P resolver request handling logic is vulnerable to hash-array amplification. A connected peer can send a compressed RequestDataType_HashArrayType direct request that is only 442 bytes on the wire but expands into 200,000 decoded hash entries inside the resolver path. The resolver's antiflood logic counts only a single logical message and the compressed wire size, and while Batch.Decompress() caps the decompressed byte size, it never limits the number of decoded repeated-field items. As a result, both TxResolver and TrieNodeResolver preallocate and iterate over the entire unchecked set of decoded hashes, causing remote memory and CPU amplification against any node that accepts P2P peer connections. This issue is fixed in version 1.7.18.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/klever-io/klever-go/releases/tag/v1.7.18
- https://github.com/klever-io/klever-go/security/advisories/GHSA-w342-mj6g-v9c4
FAQ
What is CVE-2026-47249?
CVE-2026-47249 is a vulnerability with a CVSS score of 7.5 (HIGH). Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.18, the P2P resolver request handling logic is vulnerable to hash-array amplification. A connected peer can send a co...
How severe is CVE-2026-47249?
CVE-2026-47249 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-47249?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.