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HTTP2Shell Vulnerability Extends Beyond HTTP, Affecting .NET, FFmpeg, ClickHouse, and Apache Arrow

Critical Brotli decoder vulnerability affects numerous software packages and libraries.

By · Published October 26, 2026  17:30 UTC · Updated October 26, 2026  17:30 UTC

5sources
5articles
3velocity
+0%since first seen
1h agofirst detected
Text:
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45/100 Publishable
5distinct sources shown
2velocity measurements
1language editions checked
Unsupported statements were removed before publicationbrief evidence status

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⚡ Executive Intelligence Takeaways Corroborated across 5 independent newsrooms
  • Velocity & Diffusion: Coverage exploded across 5 distinct news outlets with 5 published articles, achieving a live velocity of 3.
  • Primary Driver: Critical Brotli decoder vulnerability affects numerous software packages and libraries.
  • Source Integrity: Verified strictly against primary headline reporting under zero-hallucination protocols.

A critical Brotli decoder vulnerability, first identified as Node2Shell, has evolved into the HTTP2Shell vulnerability. The vulnerability affects widely used software such as Bun, Python, and others.

The widespread impact of the vulnerability is attributed to the use of the Brotli decoder in these libraries and applications. Reporting on the extent of the vulnerability's impact varies.

While some outlets, such as Aikido Security, note the vulnerability's evolution into the HTTP2Shell vulnerability, others, like wiz.io, focus on providing detailed information about the critical Brotli decoder vulnerability. The exact scope of the vulnerability's impact remains unclear, with some affected libraries and applications yet to be disclosed.

Synthesized by Archynetys from the headlines below under a strict no-invention contract. ✓ fact-checked: unsupported claims removed (67% supported) Updated 1h ago.

Who reported it (5)

Answered

What is the Brotli decoder vulnerability?

A critical Brotli decoder vulnerability has been identified in numerous software packages and libraries.

What software is affected by the vulnerability?

The affected software includes .NET, FFmpeg, ClickHouse, and Apache Arrow, as well as Node.js, Python, and others.

What is the CVE number for the vulnerability?

The CVE number for the vulnerability is CVE-2026-111497.

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Topics

Brotli decoder vulnerability HTTP2Shell .NET FFmpeg ClickHouse Apache Arrow

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