CVE-2026-49471: Serena is a powerful MCP toolkit for coding that provides semantic retrieval and editing capabilities

Q: How do I fix CVE-2026-49471?

serena: upgrade to 1.5.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-49471 being exploited?

CVE-2026-49471 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-49471 affect?

CVE-2026-49471 affects serena. Severity is high (CVSS 8.3). 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 authenticatio

Q: How urgent is CVE-2026-49471?

Priority 42/100. High severity; Public exploit reference

This month

HIGH 8.3UPGRADE

CVE-2026-49471 is a high-severity flaw (CVSS 8.3) affecting serena. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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, whi

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.3 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-306, CWE-352
Published	2026-07-07
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: oraios-ai

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-07 21:17 UTCPublished CVE record published
2026-10-25 20:10 UTCUpdated Record last modified

oraios-ai serena UPGRADE

Affected: < 1.5.2

Fixed in: 1.5.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy serena || rpm -q serena || serena --version

2. UPGRADE to 1.5.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade serena

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade serena

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-49471?

serena: upgrade to 1.5.2. Exact commands for each OS are on this page.

Is CVE-2026-49471 being exploited?

CVE-2026-49471 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-49471 affect?

CVE-2026-49471 affects serena. Severity is high (CVSS 8.3). 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 authenticatio

How urgent is CVE-2026-49471?

Priority 42/100. High severity; Public exploit reference

Software pages

Flask vulnerabilities

References

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