{"id":"CVE-2026-49471","aliases":["GHSA-37h2-6p4f-mp3q","PYSEC-2026-3061"],"url":"https://o3.security/vulnerability/CVE-2026-49471","summary":"Serena: Unauthenticated Flask dashboard on fixed port enables DNS rebinding → memory poisoning → RCE","details":"Serena is a powerful MCP toolkit for coding that provides semantic retrieval and editing capabilities. Prior to v1.5.2, Serena's built-in web dashboard exposes an unauthenticated Flask API on a fixed, predictable port, with no authentication, no CSRF protection, and no Host header validation. A DNS rebinding attack allows a malicious webpage to reach this API from any browser and write arbitrary content to the agent's persistent memory store, which the agent reads and acts on autonomously. Combined with execute_shell_command using shell=True, this creates a remote code execution chain requiring only that the victim visit a malicious webpage while Serena is running. This issue is fixed in version v1.5.2.","published":"2026-07-07T20:50:50.545Z","modified":"2026-08-12T03:51:43.218082558Z","cvss":{"score":8.3,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H"},"epss":{"score":0.00291,"percentile":0.21782,"asOf":"2026-08-21"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"serena-agent","fixedVersion":"1.5.2"}],"fix":{"url":"https://github.com/oraios/serena/commit/016ccbe1c095a3eed7967737ac1d4df2754f5d96","label":"oraios/serena@016ccbe"},"references":[{"type":"WEB","url":"https://github.com/oraios/serena/releases/tag/v1.5.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49471.json"},{"type":"ADVISORY","url":"https://github.com/oraios/serena/security/advisories/GHSA-37h2-6p4f-mp3q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49471"},{"type":"FIX","url":"https://github.com/oraios/serena/commit/016ccbe1c095a3eed7967737ac1d4df2754f5d96"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:43.218082558Z"}}