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Brotli flaw prompts updates across runtimes and software

Part of the CVE-2026-111497 story · since 21 Oct

Developinglatest 2 hours ago21 articles8 outlets
21 Oct · SecurityOnline first28 Oct30 OctNowThis article21st of 21
  • Wed 21 Oct, 17:54 UTC. SecurityOnline, first report. Node.js fixes Brotli flaw that could enable remote code execution. Cites a CVE in CISA KEV.
  • Fri 23 Oct, 08:35 UTC. The Hacker News, its first report on the story. Node.js Brotli flaw enables remote code execution in Linux arm64 builds. Cites a CVE in CISA KEV.
  • Sat 24 Oct, 11:00 UTC. The Hacker News. Brotli Flaw Enables Code Execution in Unpatched Node.js Builds. Cites a CVE in CISA KEV.
  • Sun 25 Oct, 08:30 UTC. The Hacker News. OpenAI Agents Expose VM Escapes and Sandbox Weaknesses. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 01:30 UTC. SecurityOnline. Brotli flaw expands Node2Shell risk across HTTP applications. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 03:19 UTC. SecurityOnline. Microsoft issues out of band .NET fixes for four flaws. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 11:00 UTC. SecurityWeek, its first report on the story. Brotli flaw triggers security updates across major software. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 13:00 UTC. SOCRadar, its first report on the story. Brotli flaw exposes Python packages to remote code execution. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 13:30 UTC. Infosecurity, its first report on the story. Microsoft patches critical .NET flaw that risks memory corruption. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 15:31 UTC. The Hacker News. Weekly recap tracks PHP and Node.js RCE flaws and supply chain attacks. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 18:30 UTC. The Hacker News. PHP releases rebuilt Windows packages to fix Brotli flaw. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 19:00 UTC. Rapid7, its first report on the story. Node.js Brotli flaw could expose memory or enable remote code execution. Cites a CVE in CISA KEV.
  • Tue 27 Oct, 02:00 UTC. SecurityOnline. Palo Alto confirms critical Brotli flaw affects PAN-OS. Cites a CVE in CISA KEV.
  • Tue 27 Oct, 20:01 UTC. CISA, its first report on the story. CISA adds exploited Google Brotli flaw to KEV catalogue. Cites a CVE in CISA KEV.
  • Tue 27 Oct, 23:00 UTC. SecurityOnline. Sweet Security offers free protection against HTTP2Shell. Cites a CVE in CISA KEV.
  • Wed 28 Oct, 01:00 UTC. SecurityOnline. CISA Adds Adobe Magento and Google Brotli Flaws to KEV Catalog. Cites a CVE in CISA KEV.
  • Wed 28 Oct, 08:00 UTC. SecurityOnline. Broadcom warns of critical VMware SDDC Manager flaw. Cites a CVE in CISA KEV.
  • Wed 28 Oct, 08:01 UTC. The Hacker News. CISA Adds Two Actively Exploited Flaws to KEV Catalog. Cites a CVE in CISA KEV.
  • Wed 28 Oct, 09:30 UTC. SecurityWeek. Researchers report exploitation attempts against Brotli flaw. Cites a CVE in CISA KEV.
  • Wed 28 Oct, 11:30 UTC. Security Affairs, its first report on the story. CISA adds Brotli and Magento flaws to its exploited list. Cites a CVE in CISA KEV.
  • Mon 2 Nov, 03:31 UTC. SecurityOnline. Brotli flaw prompts updates across runtimes and software. Cites a CVE in CISA KEV. This article, 21st of 21.

CVE-2026-111497 is an out-of-bounds write in Google’s Brotli decoder affecting the 1.0.3 through 1.2.0 releases, with broad impact because Brotli is bundled in runtimes, proxies, appliances and file tools.

The article notes the vulnerability reaches beyond a single library into various software products that perform Brotli decompression, and records an exploitation status as “exploited in the wild.” Upstream fixes are in Google Brotli (C library) versions 1.0.10, 1.1.1 and 1.2.1, with Go’s Andy Balholm Brotli binding also updated to v1.2.7.

The advisory frame cites vendor and researcher reporting, including Imperva’s demonstration of code execution potential on Node.js 24.22.0 (though without a public PoC release) and Red Hat’s stance of no widely public PoC at the time.

The piece inventories affected products with fixes available and those still lacking a released update. Among runtimes and frameworks, Node.js releases 22.23.4, 24.22.1 and 26.12.1 (as of 21 October) are patched; Bun 1.4.4; Microsoft .NET platforms (8.0.33, 9.0.22, 10.0.14 and 11.0 RC3); PowerShell 7.4.22, 7.5.13 and 7.6.9; Visual Studio updates; and PHP for Windows rebuilds bundling Brotli 1.2.1.

Also listed are Python Brotli 1.2.1, Python brotlicffi 1.2.1[.]0, Ruby brotli 0.9.1; Envoy up to 1.40.0 and Istio 1.29.9–1.31.2 with Brotli decompression enabled; and select Linux distros with specific Brotli package fixes. The article emphasises the urgency to upgrade and to locate statically linked Brotli copies still in use. It credits the Palo Alto Networks advisory, Microsoft advisory and Canadian Cyber Centre alert as sources for vendor statements. The timeline notes the listing as of 1 November 2026.

How the story developed

All 21 articles
Developinglatest 2 hours ago21 articles8 outlets

21 articles from 8 outlets since 21 Oct. Picked up again today after 5 days quiet. This was the 21st report, 11 days after the first.

Now21 Oct232425262728First reportSecurityOnline · 21 Oct, 17:54This article21st of 21 · day 12CISA alert27 Oct, 20:01 · official
  • Wed 21 Oct, 17:54 UTC. SecurityOnline, first report. Node.js fixes Brotli flaw that could enable remote code execution. Cites a CVE in CISA KEV.
  • Fri 23 Oct, 08:35 UTC. The Hacker News, its first report on the story. Node.js Brotli flaw enables remote code execution in Linux arm64 builds. Cites a CVE in CISA KEV.
  • Sat 24 Oct, 11:00 UTC. The Hacker News. Brotli Flaw Enables Code Execution in Unpatched Node.js Builds. Cites a CVE in CISA KEV.
  • Sun 25 Oct, 08:30 UTC. The Hacker News. OpenAI Agents Expose VM Escapes and Sandbox Weaknesses. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 01:30 UTC. SecurityOnline. Brotli flaw expands Node2Shell risk across HTTP applications. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 03:19 UTC. SecurityOnline. Microsoft issues out of band .NET fixes for four flaws. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 11:00 UTC. SecurityWeek, its first report on the story. Brotli flaw triggers security updates across major software. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 13:00 UTC. SOCRadar, its first report on the story. Brotli flaw exposes Python packages to remote code execution. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 13:30 UTC. Infosecurity, its first report on the story. Microsoft patches critical .NET flaw that risks memory corruption. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 15:31 UTC. The Hacker News. Weekly recap tracks PHP and Node.js RCE flaws and supply chain attacks. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 18:30 UTC. The Hacker News. PHP releases rebuilt Windows packages to fix Brotli flaw. Cites a CVE in CISA KEV.
  • Mon 26 Oct, 19:00 UTC. Rapid7, its first report on the story. Node.js Brotli flaw could expose memory or enable remote code execution. Cites a CVE in CISA KEV.
  • Tue 27 Oct, 02:00 UTC. SecurityOnline. Palo Alto confirms critical Brotli flaw affects PAN-OS. Cites a CVE in CISA KEV.
  • Tue 27 Oct, 20:01 UTC. CISA, its first report on the story. CISA adds exploited Google Brotli flaw to KEV catalogue. Cites a CVE in CISA KEV.
  • Tue 27 Oct, 23:00 UTC. SecurityOnline. Sweet Security offers free protection against HTTP2Shell. Cites a CVE in CISA KEV.
  • Wed 28 Oct, 01:00 UTC. SecurityOnline. CISA Adds Adobe Magento and Google Brotli Flaws to KEV Catalog. Cites a CVE in CISA KEV.
  • Wed 28 Oct, 08:00 UTC. SecurityOnline. Broadcom warns of critical VMware SDDC Manager flaw. Cites a CVE in CISA KEV.
  • Wed 28 Oct, 08:01 UTC. The Hacker News. CISA Adds Two Actively Exploited Flaws to KEV Catalog. Cites a CVE in CISA KEV.
  • Wed 28 Oct, 09:30 UTC. SecurityWeek. Researchers report exploitation attempts against Brotli flaw. Cites a CVE in CISA KEV.
  • Wed 28 Oct, 11:30 UTC. Security Affairs, its first report on the story. CISA adds Brotli and Magento flaws to its exploited list. Cites a CVE in CISA KEV.
  • Mon 2 Nov, 03:31 UTC. SecurityOnline. Brotli flaw prompts updates across runtimes and software. Cites a CVE in CISA KEV. This article, 21st of 21.
  • Known exploited CVE
  • No CVE
  • Larger: an outlet’s first report
  • Square: official source
  • Coverage over time
  • Quiet time, folded
Show all 21 articles as a list
  1. Wed 21 OctDay 01
    1. Node.js fixes Brotli flaw that could enable remote code execution17:54 · SecurityOnline · First report · Exploited CVE · Known exploited CVE

  2. Quiet for 2 days

    Fri 23 OctDay 21
    1. Node.js Brotli flaw enables remote code execution in Linux arm64 builds08:35 · The Hacker News · Known exploited CVE
  3. Sat 24 OctDay 31
    1. Brotli Flaw Enables Code Execution in Unpatched Node.js Builds11:00 · The Hacker News · Known exploited CVE
  4. Sun 25 OctDay 41
    1. OpenAI Agents Expose VM Escapes and Sandbox Weaknesses08:30 · The Hacker News · Known exploited CVE
  5. Mon 26 OctDay 58
    1. Brotli flaw expands Node2Shell risk across HTTP applications01:30 · SecurityOnline · Known exploited CVE
    2. Microsoft issues out of band .NET fixes for four flaws03:19 · SecurityOnline · Known exploited CVE
    3. Brotli flaw triggers security updates across major software11:00 · SecurityWeek · Known exploited CVE
    Show 5 more from 26 Oct
    1. Brotli flaw exposes Python packages to remote code execution13:00 · SOCRadar · Known exploited CVE
    2. Microsoft patches critical .NET flaw that risks memory corruption13:30 · Infosecurity · Known exploited CVE
    3. Weekly recap tracks PHP and Node.js RCE flaws and supply chain attacks15:31 · The Hacker News · Known exploited CVE
    4. PHP releases rebuilt Windows packages to fix Brotli flaw18:30 · The Hacker News · Known exploited CVE
    5. Node.js Brotli flaw could expose memory or enable remote code execution19:00 · Rapid7 · Known exploited CVE
  6. Tue 27 OctDay 63
    1. Palo Alto confirms critical Brotli flaw affects PAN-OS02:00 · SecurityOnline · Known exploited CVE
    2. CISA adds exploited Google Brotli flaw to KEV catalogue20:01 · CISA · official · CISA alert · Known exploited CVE
    3. Sweet Security offers free protection against HTTP2Shell23:00 · SecurityOnline · Known exploited CVE
  7. Wed 28 OctDay 75
    1. CISA Adds Adobe Magento and Google Brotli Flaws to KEV Catalog01:00 · SecurityOnline · Known exploited CVE
    2. Broadcom warns of critical VMware SDDC Manager flaw08:00 · SecurityOnline · Known exploited CVE
    3. CISA Adds Two Actively Exploited Flaws to KEV Catalog08:01 · The Hacker News · Known exploited CVE
    Show 2 more from 28 Oct
    1. Researchers report exploitation attempts against Brotli flaw09:30 · SecurityWeek · Known exploited CVE
    2. CISA adds Brotli and Magento flaws to its exploited list11:30 · Security Affairs · Known exploited CVE

  8. Quiet for 5 days

    Mon 2 NovDay 121
    1. Brotli flaw prompts updates across runtimes and software03:31 · SecurityOnline · Picked up again · Known exploited CVE · This article, 21st of 21

Sources

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