{"cve":"CVE-2026-52880","nvd":{"published":"2026-08-07T23:17:04.890","modified":"2026-10-24T16:10:00.153","status":"Deferred","description":"Klever-Go is the Go implementation of the Klever blockchain protocol. Versions from 1.7.14 through 1.7.17 are vulnerable to a remotely triggerable denial of service. Both REST APIs are started with the Gin Engine.Run convenience method, which serves requests through Go's default HTTP server with no ReadHeaderTimeout, ReadTimeout, or MaxHeaderBytes configured. As a result, incoming connections that never complete their request headers are held open indefinitely. When a REST listener is reachable beyond localhost through the documented all-interface bind or a Docker port-publish deployment, a single unauthenticated client can open many slow-header connections and hold them open until server file descriptors are exhausted, preventing the API from accepting new connections. This renders the REST API unavailable to legitimate clients. This issue is fixed in version 1.7.18.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400","CWE-770"],"references":["https://github.com/klever-io/klever-go/releases/tag/v1.7.18","https://github.com/klever-io/klever-go/security/advisories/GHSA-w4c6-7r69-w7j9","https://github.com/klever-io/klever-go/security/advisories/GHSA-w4c6-7r69-w7j9"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:34.184483516+00:00"},"epss":{"cve":"CVE-2026-52880","score":0.00488,"percentile":0.41708,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-w4c6-7r69-w7j9","url":"https://osv.dev/vulnerability/GHSA-w4c6-7r69-w7j9","summary":"klever-go: REST API slow-header connection exhaustion via Gin Engine.Run","modified":"2026-06-25T23:11:20.140597575Z","packages":[{"ecosystem":"Go","name":"github.com/klever-io/klever-go","purl":"pkg:golang/github.com/klever-io/klever-go","ranges":[">=1.7.14 <1.7.18"],"fixed":["1.7.18"]}]},{"id":"GO-2026-5686","url":"https://osv.dev/vulnerability/GO-2026-5686","summary":"klever-go: REST API slow-header connection exhaustion via Gin Engine.Run in github.com/klever-io/klever-go","modified":"2026-06-25T23:01:26.821187406Z","packages":[{"ecosystem":"Go","name":"github.com/klever-io/klever-go","purl":"pkg:golang/github.com/klever-io/klever-go","ranges":[">=1.7.14 <1.7.18"],"fixed":["1.7.18"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}