CVE-2026-111497
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
- In the wild
- CISA lists this as exploited in real attacks. Treat as urgent.
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- ReservedThe CVE id was reserved by its CNA
- PublishedDisclosed publicly on CVE.org and NVD
- 2026-10-27 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
- 2026-11-10 Remediation deadlineCISA's due date for federal agencies to fix it
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
- Exploit odds: 82.6% in the next 30 days (EPSS).
- Severity: 9.2 CRITICAL (CVSS).
- Fix: a patch or advisory is linked.
- It meets the bar for Drop everything: critical, and exploited or very likely to be.
Details
- Published
- Last modified
- Added to CISA KEV
- 2026-10-27
- Exploit probability
- 82.6% · EPSS, next 30 days
- Weakness
- CWE-252
- Record status
- Modified
Affected
- Google Brotli < 1.0.10
- Google Brotli < 1.1.1
- Google Brotli < 1.2.1
- Nodejs node.js < 22.23.4
- Nodejs node.js < 24.22.1
- Nodejs node.js < 26.12.1
- python-hyper Brotlicffi < 1.2.1.0
- Microsoft .net < 8.0.33
Attack profile CVSS 4.0 · 9.2
- Attack vector
- Network
- Complexity
- Low
- Attack requirements
- Present
- Privileges needed
- None
- User interaction
- None
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Raw vector
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
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-111497.md and follow it. Check whether this project is affected by CVE-2026-111497. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/andybalholm/brotli/releases/tag/v1.2.7
- https://github.com/advisories/GHSA-9v8h-qqgm-4m35
- https://github.com/dotnet/announcements/issues/494
- https://github.com/google/brotli/releases/tag/v1.0.10
- https://github.com/google/brotli/releases/tag/v1.1.1
- https://github.com/google/brotli/releases/tag/v1.2.1
References
- https://github.com/andybalholm/brotli/releases/tag/v1.2.7
- https://nodejs.org/en/blog/vulnerability/october-2026-security-releases#nodejs-brotli-decoder-out-of-bounds-write-permits-remote-code-execution-cve-2026-111497---high
- http://www.openwall.com/lists/oss-security/2026/10/23/25
- http://www.openwall.com/lists/oss-security/2026/10/24/6
- http://www.openwall.com/lists/oss-security/2026/10/26/12
- http://www.openwall.com/lists/oss-security/2026/10/26/13
- http://www.openwall.com/lists/oss-security/2026/10/26/16
- http://www.openwall.com/lists/oss-security/2026/11/03/2
- https://broccoli2shell.com
- https://github.com/advisories/GHSA-9v8h-qqgm-4m35
- https://github.com/dotnet/announcements/issues/494
- https://github.com/google/brotli/releases/tag/v1.0.10
- https://github.com/google/brotli/releases/tag/v1.1.1
- https://github.com/google/brotli/releases/tag/v1.2.1
- https://lists.debian.org/debian-lts-announce/2026/10/msg00049.html
- https://patchtheplanet.org/brotli
- https://www.aikido.dev/blog/node2shell-nodejs-brotli-rce-cve-2026-111497
- https://cert-portal.siemens.com/productcert/html/ssa-045512.html
- https://cert-portal.siemens.com/productcert/html/ssa-242944.html
- https://cert-portal.siemens.com/productcert/html/ssa-443410.html
- https://cert-portal.siemens.com/productcert/html/ssa-678870.html
- https://cert-portal.siemens.com/productcert/html/ssa-898633.html
- https://ellio.tech/en/blog/node2shell-cve-2026-111497-rce-on-stock-nodejs-builds/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-111497