Serena: Unauthenticated Flask dashboard on fixed port enables DNS rebinding → memory poisoning → RCE

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Summary

CVECVE-2026-49471
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-07 21:17:25 UTC
Updated2026-07-07 21:17:25 UTC
DescriptionSerena 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.

Risk And Classification

Primary CVSS: v3.1 8.3 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Problem Types: CWE-306 | CWE-352 | CWE-306 CWE-306: Missing Authentication for Critical Function | CWE-352 CWE-352: Cross-Site Request Forgery (CSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.3HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
3.1CNADECLARED8.3HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Oraios Serena affected < 1.5.2 Not specified

References

ReferenceSourceLinkTags
github.com/oraios/serena/releases/tag/v1.5.2 [email protected] github.com
github.com/oraios/serena/security/advisories/GHSA-37h2-6p4f-mp3q [email protected] github.com
github.com/oraios/serena/commit/016ccbe1c095a3eed7967737ac1d4df2754f5d96 [email protected] github.com
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