Vulnerability · Published Jul 7, 2026 · Assigned by GitHub_M

CVE-2026-49471Serena: Unauthenticated Flask dashboard on fixed port enables DNS rebinding → memory poisoning → RCE

High 8.3

In plain English

A high-severity missing authentication in serena from oraios. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.3High

Exploit odds (30 days)0.4%top 68.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	serena-agent	1.5.2	GHSA-37h2-6p4f-mp3q
PyPI	serena-agent	1.5.2	PYSEC-2026-3061

Affected products (as reported)

Vendor	Product	Versions
oraios	serena	< 1.5.2

Weakness: CWE-306, CWE-352 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

References

https://github.com/oraios/serena/security/advisories/GHSA-37h2-6p4f-mp3q x_refsource_CONFIRM
https://github.com/oraios/serena/commit/016ccbe1c095a3eed7967737ac1d4df2754f5d96 x_refsource_MISC
https://github.com/oraios/serena/releases/tag/v1.5.2 x_refsource_MISC