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

> An attacker can achieve remote code execution by using DNS rebinding to exploit an unauthenticated Flask dashboard and poison agent memory.

- **Severity:** High 8.3 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 7 Jul 2026
- **Updated:** 9 Jul 2026
- **Also known as:** GHSA-37h2-6p4f-mp3q, PYSEC-2026-3061

## What is CVE-2026-49471?

CVE-2026-49471 is a high-severity vulnerability in oraios serena, published on 7 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### 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.

Weakness: CWE-352 (Cross-Site Request Forgery), CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-49471?

3 open source packages ship an affected version, including serena-agent. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `serena-agent` | PyPI | All versions | 1.5.2 |
| `serena-agent` | PyPI | All versions | 1.5.2 |
| `serena-agent` | PyPI | All versions | 1.5.2 |

Products: Oraios-Ai Serena.

## How do I fix CVE-2026-49471?

Upgrade serena-agent to 1.5.2 or later.

## Is CVE-2026-49471 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49471 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-49471 and fix it if it is affected.

What it is: CVE-2026-49471 is a high-severity vulnerability in oraios serena, published on 7 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49471 exists.

Affected packages and fixed versions:
- serena-agent (PyPI): affected all versions; fixed in 1.5.2
- serena-agent (PyPI): affected all versions; fixed in 1.5.2
- serena-agent (PyPI): affected all versions; fixed in 1.5.2

Task:
1. 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.
2. 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.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-49471/ (Markdown: https://insights.sbomify.com/CVE-2026-49471/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-49471
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-49471
- OSV: https://osv.dev/vulnerability/CVE-2026-49471

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-49471/
Summaries are generated and may contain mistakes; the official description above is the record.