Klever-Go KVM: Hash-array amplification in P2P resolver request handling (CVE-2026-47249) | HOL Guard CVE

High · CVSS 7.5CVE-2026-47249GHSA-W342-MJ6G-V9C4

Klever-Go KVM: Hash-array amplification in P2P resolver request handling

Answer in brief

CVE-2026-47249 records a High severity (CVSS 7.5) vulnerability in Klever-Go KVM: Hash-array amplification in P2P resolver request handling. The current sources do not mark it as known exploited. The current feed maps klever-io/klever-go (generic), github.com/klever-io/klever-go (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 7, 2026Updated Sep 9, 2026Source checked Sep 17, 2026First seen by HOL Jun 11, 2026Material review Sep 9, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps klever-io/klever-go (generic), github.com/klever-io/klever-go (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
klever-io/klever-gogeneric	< 1.7.18	Not reported
github.com/klever-io/klever-gogo	<1.7.18	1.7.18

Recommended response

Check inventory. Check lockfiles and deployed manifests for klever-io/klever-go, github.com/klever-io/klever-go.
Review the reported fix. Update github.com/klever-io/klever-go to 1.7.18 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 7, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 11, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.