Covered by 2 outlets — first reported by Rapid7 Blog, Oct 26, 17:32 UTC
CVE-2026-111497: Critical out-of-bounds write in the Node.js Brotli decoder
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In brief
A vulnerability in Brotli, Google’s widely used open-source compression library, is putting a broad range of software at risk. About CVE-2026-111497 Alternatively known as “Node2Shell”, “Broccoli2Shell” and “Brotli2Shell”, CVE-2026-111497 is a remotely exploitable out-of-bounds write flaw that gained widespread attention after Node.js publicly disclosed it on October 21, 2026.
From Help Net Security's coverage.
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2 outlets, in the order they reported it.
Rapid7 BlogFirst report
CVE-2026-111497: Critical out-of-bounds write in the Node.js Brotli decoder
Overview On October 21, 2026, the Node.js Project published a security advisory for CVE-2026-111497 , an out-of-bounds write in the Brotli decoder bundled with Node.js.
Help Net Security
Brotli bug reaches far beyond Node.js (CVE-2026-111497)
A vulnerability in Brotli, Google’s widely used open-source compression library, is putting a broad range of software at risk.
Explained
The technology and terms in this story. Learn more
- WeaknessMemory corruptionBugs that let a program write where it shouldn't in memory, often leading to code execution.
- AttackRemote code execution · RCEA flaw that lets an attacker run their own code on someone else's machine over the network.
- ConceptKEV · Known Exploited Vulnerabilities catalogCISA's list of vulnerabilities with evidence of real-world exploitation.
- ConceptCVE · Common Vulnerabilities and ExposuresThe public ID system for vulnerabilities, such as CVE-2026-12345, so everyone means the same bug.
Why it was possible
The weaknesses behind this story's CVEs, from each CVE Record.