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Node2Shell Vulnerability Expands to Go Frameworks with Active Exploitation

Node2Shell Vulnerability Expands to Go Frameworks with Active Exploitation

First seen 27 Oct 2026, 18:47 UTC • •
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ThreatCluster AI
ThreatCluster •October 27, 2026 at 21:19 UTC
  • •Node2Shell vulnerability (CVE-2026-111497) confirmed to be actively exploited.
  • •Affected frameworks include Traefik, Fiber, and Iris, with significant adoption metrics.
  • •Sweet Security offers Virtual Patching for immediate protection while permanent fixes are developed.

Sweet Security has identified the Node2Shell vulnerability, CVE-2026-111497, affecting the Brotli decoder in multiple programming environments, including Go frameworks like Traefik, Fiber, and Iris. The vulnerability has been confirmed to be, with Sweet Security observing attempts in 88% of monitored environments. Organizations using these frameworks are urged to implement Sweet Security's Virtual Patching, which provides immediate protection against exploitation while permanent fixes are developed. The vulnerability is, with a CVSS score of 9.2, and poses a significant risk due to its widespread adoption in major HTTP frameworks. A patch for the Go implementation was released on October 23, 2026, but full remediation across all affected systems will take weeks.

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Timeline

2026-10-22
CVE-2026-111497 published
Node2Shell vulnerability disclosed with a CVSS score of 9.2, indicating critical severity.
Finance.Yahoo
2026-10-23
Patch released for Go implementation
A fix was pushed for the Go implementation of the Brotli compression library, addressing the Node2Shell vulnerability.
Markets.Businessinsider
2026-10-25
Sweet Security announces findings
Sweet Security disclosed the expanded scope of the Node2Shell vulnerability affecting Go frameworks.
Markets.Businessinsider
2026-10-27
Virtual Patching announced
Sweet Security introduced Virtual Patching to protect organizations from Node2Shell exploitation for 30 days at no cost.
Finance.Yahoo

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Extracted Entities (14)

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Common questions

Which frameworks are affected by Node2Shell?
The vulnerability affects Go frameworks including Traefik, Fiber, and Iris, among others.
How is this vulnerability being exploited?
Active exploitation attempts have been observed in 88% of monitored environments, indicating a significant risk.
What immediate actions should organizations take?
Organizations should implement Sweet Security's Virtual Patching to block exploitation while permanent fixes are developed.