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CVE-2026-49471 is a high-severity remote code execution vulnerability affecting Serena prior to version 1.5.2. Serena’s built-in web dashboard exposes a local Flask API on a fixed, predictable port and, in affected versions, that API lacks authentication, CSRF protection, and HTTP Host header validation. These weaknesses allow a DNS rebinding attack in which a victim’s browser, after visiting a malicious webpage, can be induced to send same-origin requests to the local Serena dashboard service. Through the exposed API, an attacker can write arbitrary content into Serena’s persistent memory store. Because Serena autonomously reads and acts on that memory, the injected content can influence agent behavior. When chained with Serena’s execute_shell_command functionality, which uses shell=True, the memory poisoning can be escalated into arbitrary operating system command execution on the host running Serena. The issue is fixed in Serena version 1.5.2.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An unauthenticated remote code execution vulnerability in the Serena MCP Toolkit caused by DNS rebinding against an unauthenticated local Flask API, enabling memory poisoning and arbitrary command execution on the developer workstation.
An unauthenticated Flask dashboard/API exposure in Serena that can be reached via DNS rebinding, enabling memory poisoning and leading to remote code execution.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.