{"answers":{"affected":"3 open source packages ship an affected version, including github.com/klever-io/klever-go.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52880 exists.","fix":"Upgrade github.com/klever-io/klever-go to 1.7.18 or later.","what":"CVE-2026-52880 is a high-severity denial of service vulnerability in klever-io klever-go, published on 7 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-52880 and fix it if it is affected.\n\nWhat it is: CVE-2026-52880 is a high-severity denial of service vulnerability in klever-io klever-go, published on 7 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52880 exists.\n\nAffected packages and fixed versions:\n- github.com/klever-io/klever-go (Go): affected from 1.7.14; fixed in 1.7.18\n- github.com/klever-io/klever-go (Go): affected from 1.7.14; fixed in 1.7.18\n- github.com/klever-io/klever-go (Go): affected from 1.7.14; fixed in 1.7.18\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-52880/ (Markdown: https://insights.sbomify.com/CVE-2026-52880/index.md)","id":"CVE-2026-52880","markdown":"https://insights.sbomify.com/CVE-2026-52880/index.md","name":"CVE-2026-52880","record":{"aliases":["GHSA-w4c6-7r69-w7j9","GO-2026-5686"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Klever blockchain node","requires_auth":"none","summary":"Unauthenticated attackers can exhaust server file descriptors via slow-header connections, causing denial of service for the REST API.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"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.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Klever-Go: REST API slow-header connection exhaustion via Gin Engine.Run","id":"CVE-2026-52880","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"Notepad++: CVE-2026-48800 Bypass","id":"CVE-2026-52884"},"packages":[{"ecosystem":"Go","fixed":["1.7.18"],"introduced":["1.7.14"],"last_affected":[],"package":"github.com/klever-io/klever-go","purl":null,"source":"GHSA-w4c6-7r69-w7j9"},{"ecosystem":"Go","fixed":["1.7.18"],"introduced":["1.7.14"],"last_affected":[],"package":"github.com/klever-io/klever-go","purl":"pkg:golang/github.com/klever-io/klever-go","source":"GHSA-w4c6-7r69-w7j9"},{"ecosystem":"Go","fixed":["1.7.18"],"introduced":["1.7.14"],"last_affected":[],"package":"github.com/klever-io/klever-go","purl":"pkg:golang/github.com/klever-io/klever-go","source":"GO-2026-5686"}],"prev":{"headline":"Klever-Go: Unbounded goroutine spawn on direct-message ingress enables peer-driven DoS","id":"CVE-2026-52879"},"products":["klever-go"],"published":"2026-08-07","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-11","vendors":["klever-io"]},"summary":"Unauthenticated attackers can exhaust server file descriptors via slow-header connections, causing denial of service for the REST API.","url":"https://insights.sbomify.com/CVE-2026-52880/"}