CVE-2026-47249
Klever-Go KVM: Hash-array amplification in P2P resolver request handling
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.
INFO
Published Date :
Aug. 7, 2026, 11:17 p.m.
Last Modified :
Oct. 23, 2026, 8:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update Klever-Go to version 1.7.18.
- Apply vendor-supplied patches if available.
- Review peer connection security settings.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-47249.
| URL | Resource |
|---|---|
| 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-47249 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-47249
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-47249 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-47249 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Oct. 23, 2026
Action Type Old Value New Value Added Translation Title: klever-go de klever-io, Description: Klever-Go es la implementación en Go del protocolo de cadena de bloques Klever. Antes de la versión 1.7.18, la lógica de manejo de solicitudes del resolvedor P2P es vulnerable a la amplificación de arreglos de hashes. Un par conectado puede enviar una solicitud directa comprimida de tipo RequestDataType_HashArrayType que tiene solo 442 bytes en el cable, pero se expande a 200.000 entradas de hash decodificadas dentro de la ruta del resolvedor. La lógica anti-inundación del resolvedor cuenta solo un único mensaje lógico y el tamaño comprimido en el cable, y aunque Batch.Decompress() limita el tamaño de bytes descomprimidos, nunca limita el número de elementos de campo repetidos decodificados. Como resultado, tanto TxResolver como TrieNodeResolver preasignan e iteran sobre todo el conjunto no verificado de hashes decodificados, causando amplificación remota de memoria y CPU contra cualquier nodo que acepte conexiones de pares P2P. Este problema está solucionado en la versión 1.7.18. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 10, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-47249', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-10T14:07:15.833735Z'} -
New CVE Received by [email protected]
Aug. 07, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'klever-io', 'product': 'klever-go', 'versions': [{'status': 'affected', 'version': '< 1.7.18'}]}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-400 Added Reference https://github.com/klever-io/klever-go/releases/tag/v1.7.18 Added Reference https://github.com/klever-io/klever-go/security/advisories/GHSA-w342-mj6g-v9c4