Brotli2Shell: Frequently asked questions for Google Brotli decoder vulnerability (CVE-2026-111497)
2026-10-27T08:52:11Z•eb382386fd1b894811a437bd08c5702ad451621ffd927c75bf973bd533053f1f
CVE-2026-109618CVE-2026-109619CVE-2026-111497.NETBrotliBrotli2ShellBunCISA KEVEnvoy ProxyIstioNode.jsPHPPHP2Shellactive exploitationmemory corruptionout-of-bounds writepatch managementpublic PoCremote code execution
What happened
Tenable reports that CVE-2026-111497 (Brotli2Shell) is a critical out-of-bounds write in Google’s Brotli decoder that can enable remote code execution when applications decompress attacker-controlled data. Public proof-of-concept exploits are available, and affected ecosystems include Node.js, .NET, Bun, Envoy, Istio, Python HTTP clients, FFmpeg, Apache Arrow, ClickHouse, and PHP for Windows. The same feed also highlights actively exploited critical PHP2Shell vulnerabilities CVE-2026-109618 and CVE-2026-109619, which are listed in CISA’s KEV catalog.
Why it matters
A reviewed impact interpretation has not been published for this record.
Evidence and limitations
- Source ID
- tenable_blog
- Record identifier
- eb382386fd1b894811a437bd08c5702ad451621ffd927c75bf973bd533053f1f
- Enrichment time
- 2026-10-27T08:52:11Z
- AI-assisted enrichment
- Yes
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