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Response snapshot Oct 27, 2026, 02:01 UTC

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VulnerabilityCVE-2026-111497

Researchers Demonstrate Node2Shell RCE Exploit on Node.js Build Using Crafted Brotli Data

A buffer overflow vulnerability in the Brotli decoder (c/dec/decode.c) in Google Brotli versions 1.0.3 through 1.2.

At a glance

Exploited
Not known
Severity
9.2 Critical (CVSS 4.0)
Chance of exploitation
36.0% in the next 30 days
Sources
4 independent sources

What to do

Check the vendor advisory for affected versions and fixes.

Read NVD CVE-2026-111497 (opens a new tab)

What happened

A buffer overflow vulnerability in the Brotli decoder (c/dec/decode.c) in Google Brotli versions 1.0.3 through 1.2.0 on all platforms allows a remote unauthenticated attacker to corrupt adjacent decoder state memory, disclose sensitive memory contents, cause a denial of service, or potentially execute arbitrary code using a crafted Brotli-compressed stream.

Users need to update any Brotli libraries or binaries between 1.0.3 through 1.2.0 to the latest available version: 1.0.10 or 1.1.1 or 1.2.1.

Scores and how they were measured

CVSS base severity

9.2

Version 4.0As of

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

36.0%

Scored Percentile 98.5%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    NVD CVE-2026-111497 (opens a new tab)

    NVD record: description, CVSS (the CNA score is preferred), affected products, and publication date. Not evidence of exploitation.

    Published Checked

  2. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  4. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  5. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  6. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  7. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  8. Primary source

    JPCERT/CC Japan Advisories: Security alert: Out-of-bounds write vulnerability in the C implementation of Brotli (CVE-2026-111497) (published) (opens a new tab)

    Exact official article/advisory identified by the feed; title, source dates, and any supplied article excerpt.

    Published Checked

  9. Primary source

    JPCERT/CC Japan Advisories syndication feed (opens a new tab)

    The RSS/Atom/RDF entry supplied this exact link and any available title, date, and excerpt.

    Published Date not suppliedChecked

  10. Reporting

    The Hacker News: Researchers Demonstrate Node2Shell RCE Exploit on Node.js Build Using Crafted Brotli Data (opens a new tab)

    The article reports this vulnerability. It is reporting, not independently primary-confirmed or locally reviewed.

    Published Checked

  11. Reporting

    The Hacker News syndication feed (opens a new tab)

    The RSS/Atom/RDF entry supplied this exact link and any available title, date, and excerpt.

    Published Date not suppliedChecked

  12. Reporting

    The Hacker News: Brotli Decoder Flaw Behind Node.js RCE Also Affects Bun, Python and Other Widely Used Software (opens a new tab)

    The article reports this vulnerability. It is reporting, not independently primary-confirmed or locally reviewed.

    Published Checked

  13. Reporting

    The Hacker News: PHP Issues Second Windows Security Update in Five Days to Fix Brotli Code Execution Flaw (opens a new tab)

    The article reports this vulnerability. It is reporting, not independently primary-confirmed or locally reviewed.

    Published Checked

  14. Reporting

    SecurityWeek: Node2Shell: Brotli Flaw Triggers Patching Across Microsoft, Node.js, Python Packages (opens a new tab)

    The article reports this vulnerability. It is reporting, not independently primary-confirmed or locally reviewed.

    Published Checked

  15. Reporting

    SecurityWeek syndication feed (opens a new tab)

    The RSS/Atom/RDF entry supplied this exact link and any available title, date, and excerpt.

    Published Date not suppliedChecked

  16. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-111497, scored 2026-10-26. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 26). Researchers Demonstrate Node2Shell RCE Exploit on Node.js Build Using Crafted Brotli Data (CVE-2026-111497). https://kevwire.com/record/CVE-2026-111497

MLA

"Researchers Demonstrate Node2Shell RCE Exploit on Node.js Build Using Crafted Brotli Data (CVE-2026-111497)." KEVWire, 26 Oct. 2026, kevwire.com/record/CVE-2026-111497.

Chicago

KEVWire. "Researchers Demonstrate Node2Shell RCE Exploit on Node.js Build Using Crafted Brotli Data (CVE-2026-111497)." Last modified October 26, 2026. https://kevwire.com/record/CVE-2026-111497.

Evidence summary (plain text)

Researchers Demonstrate Node2Shell RCE Exploit on Node.js Build Using Crafted Brotli Data (Oct 22, 2026).
A buffer overflow vulnerability in the Brotli decoder (c/dec/decode.c) in Google Brotli versions 1.0.3 through 1.2.0 on all platforms allows a remote unauthenticated attacker to corrupt adjacent decoder state memory, disclose sensitive memory contents, cause a denial of service, or potentially execute arbitrary code using a crafted Brotli-compressed stream.





Users need to update any Brotli libraries or binaries between 1.0.3 through 1.2.0 to the latest available version: 1.0.10 or 1.1.1 or 1.2.1.
CVSS 9.2 (version 4.0; evidence as of Oct 26, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-111497).
EPSS 36.0% for the following 30 days, scored Oct 26, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-111497&date=2026-10-26).
Sources:
NVD CVE-2026-111497: https://nvd.nist.gov/vuln/detail/CVE-2026-111497
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-26T17:56:10.576Z&lastModEndDate=2026-10-26T19:25:57.867Z&resultsPerPage=500&startIndex=500
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-26T17:21:53.012Z&lastModEndDate=2026-10-26T18:55:55.651Z&resultsPerPage=500&startIndex=500
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-26T16:51:02.326Z&lastModEndDate=2026-10-26T18:20:57.477Z&resultsPerPage=500&startIndex=500
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-26T13:46:51.330Z&lastModEndDate=2026-10-26T15:20:55.429Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-26T13:11:54.490Z&lastModEndDate=2026-10-26T14:45:57.368Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?pubStartDate=2026-10-12T13:35:55.142Z&pubEndDate=2026-10-26T13:35:55.142Z&resultsPerPage=500&startIndex=8500
JPCERT/CC Japan Advisories: Security alert: Out-of-bounds write vulnerability in the C implementation of Brotli (CVE-2026-111497) (published): https://www.jpcert.or.jp/at/2026/at260034.html
JPCERT/CC Japan Advisories syndication feed: https://www.jpcert.or.jp/rss/jpcert.rdf
The Hacker News: Researchers Demonstrate Node2Shell RCE Exploit on Node.js Build Using Crafted Brotli Data: https://thehackernews.com/2026/10/researchers-demonstrate-node2shell-rce.html
The Hacker News syndication feed: https://feeds.feedburner.com/TheHackersNews
The Hacker News: Brotli Decoder Flaw Behind Node.js RCE Also Affects Bun, Python and Other Widely Used Software: https://thehackernews.com/2026/10/brotli-decoder-flaw-behind-nodejs-rce.html
The Hacker News: PHP Issues Second Windows Security Update in Five Days to Fix Brotli Code Execution Flaw: https://thehackernews.com/2026/10/php-issues-second-windows-security.html
SecurityWeek: Node2Shell: Brotli Flaw Triggers Patching Across Microsoft, Node.js, Python Packages: https://www.securityweek.com/node2shell-brotli-flaw-triggers-patching-across-microsoft-node-js-python-packages/
SecurityWeek syndication feed: https://www.securityweek.com/feed/
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-111497&date=2026-10-26
Record ID: CVE-2026-111497.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 27, 2026, 01:40 UTC. Ingestion is not an independent editorial investigation.

NVD status: Awaiting Analysis. Publication in the NVD is not evidence of exploitation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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Record details

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