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CVE-2026-63119 is a denial-of-service vulnerability in the Model Context Protocol Ruby SDK, distributed as the mcp gem, affecting versions prior to 0.23.0. The flaw is caused by use of Ruby IO#gets on stdio transport paths without an explicit byte limit in MCP::Server::Transports::StdioTransport and MCP::Client::Stdio. A connected peer or spawned subprocess can send a continuous stream that never includes a newline delimiter, causing the runtime to continue growing the buffer for a single unterminated line until process memory is exhausted. The issue affects both client and server stdio communication paths and results in uncontrolled resource consumption rather than code execution or data disclosure.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.