Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-47249— Klever-Go KVM: Hash-array amplification in P2P resolver request handling

Quick assessment

Affected
klever-io klever-go
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Klever是Klever组织的一个高性能区块链网络，专为去中心化应用、资产管理和智能合约执行而设计。 Klever 1.7.18之前版本存在资源管理错误漏洞，该漏洞源于P2P解析器请求处理逻辑存在哈希数组放大问题，可能导致已连接的对等方发送压缩的RequestDataType_HashArrayType直接请求，该请求在线路上仅为442字节，但在解析器路径中可扩展为200000个解码哈希条目，且解析器的防泛洪逻辑仅计算单个逻辑消息和压缩线大小，Batch.Decompress()虽限制解压字节大小但未限

CVSS 7.5 · High EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
klever-io klever-go < 1.7.18 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-47249

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Klever-Go KVM: Hash-array amplification in P2P resolver request handling
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Klever 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Klever是Klever组织的一个高性能区块链网络，专为去中心化应用、资产管理和智能合约执行而设计。 Klever 1.7.18之前版本存在资源管理错误漏洞，该漏洞源于P2P解析器请求处理逻辑存在哈希数组放大问题，可能导致已连接的对等方发送压缩的RequestDataType_HashArrayType直接请求，该请求在线路上仅为442字节，但在解析器路径中可扩展为200000个解码哈希条目，且解析器的防泛洪逻辑仅计算单个逻辑消息和压缩线大小，Batch.Decompress()虽限制解压字节大小但未限
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
klever-io klever-go < 1.7.18 -

II. Public POCs for CVE-2026-47249

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8205 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-47249

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-47249 (2)

Same Patch Batch · klever-io · 2026-08-07 · 6 CVEs total

CVE-2026-52878 7.5 HIGH Klever-Go: Unauthenticated nil-pointer DoS in P2P transaction validation can halt the chai
CVE-2026-52879 7.5 HIGH Klever-Go: Unbounded goroutine spawn on direct-message ingress enables peer-driven DoS
CVE-2026-52880 7.5 HIGH Klever-Go: REST API slow-header connection exhaustion via Gin Engine.Run
CVE-2026-58262 7.1 HIGH Klever-Go: PubKeysBitmap padding bits bypass the BLS signature quorum
CVE-2026-49343 5.9 MEDIUM Klever-Go KVM: Throttler slot leak in trie account-data sync causes epoch bootstrap / stat

IV. Related Vulnerabilities

Same product: klever-go
Same vendor: klever-io
Same weakness: CWE-400

V. Comments for CVE-2026-47249

No comments yet

Leave a comment