{"id":"CVE-2026-101088","summary":"Nezha before 2.3.1 Denial of Service via Concurrent Server Delete","details":"Nezha is a server and website monitoring tool. In versions \u003e= 2.2.11 and \u003c 2.3.1, the service sentinel worker (service/singleton/servicesentinel.go) contains an incomplete fix for a previously reported nil dereference denial of service (GHSA-qjpp-gffx-2wm9). The 2026-07-21 fix re-validated the service lifecycle under serviceResponseDataStoreLock but reused an already-captured, now stale reporter pointer and never re-validated the server, and that lock does not guard ServerShared. An authenticated user with the member role who owns an agent can issue a concurrent server delete (POST /api/v1/batch-delete/server) for their own server to win the race window, causing the worker to dereference a missing entry in the server list snapshot. Because the sentinel workers and the gRPC server have no recover()/recovery interceptor, the resulting panic is unrecovered and crashes the entire instance. This is fixed in version 2.3.1.","aliases":["GHSA-jx78-55p5-rwv5"],"modified":"2026-09-30T03:30:57.083934277Z","published":"2026-09-27T20:49:59.487Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101088.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-367"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101088.json"},{"type":"ADVISORY","url":"https://github.com/nezhahq/nezha/security/advisories/GHSA-jx78-55p5-rwv5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101088"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/nezha-before-2.3.1-denial-of-service-via-concurrent-server-delete"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nezhahq/nezha","events":[{"introduced":"5d7e8b58af927abd9a1e7381c1269c9f2256eae1"},{"fixed":"a9d14a0dfa1e0d001b0b237b6afe91b07c67e7a5"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"2.2.11"},{"fixed":"2.3.1"}]}}],"versions":["v2.3.0","v2.2.11"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-101088.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}