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CVE.org (no NVD analysis yet)· CNA Google

CVE-2026-111497: Out-of-Bounds Write in Google Brotli Decoder

Noroxi assessment

Priority: Now (action score 91/100)

  • CISA has confirmed exploitation in the wild (Oct 27, 2026). Remediation deadline for US federal agencies: Nov 10, 2026.
  • A ready-made attack module is public (Nuclei); exploiting it takes no special expertise.
  • Probability of exploitation in the next 30 days: 82.6% (FIRST EPSS); higher than 99.6% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Google Brotli 1.0.10, 1.1.1, 1.2.1; .NET 10.0 installed on Linux 10.0.403; .NET 10.0 installed on Mac OS 10.0.403.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Patch today or shut off access. Upgrade to Google Brotli 1.0.10, 1.1.1, 1.2.1; .NET 10.0 installed on Linux 10.0.403; .NET 10.0 installed on Mac OS 10.0.403 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

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.

CriticalCVSS 9.2 · v4.0KEVWeaponized Fix available
Published
Oct 22, 2026
Updated
Nov 6, 2026
EPSS
82.6% · 99th percentile

Report tools

JSON

Action score

91

Now

Patch today or shut off access.

CVSS
36 / 40 · 9.2 / 10
CISA KEV
30 / 30 · Listed
EPSS
25 / 30 · 82.6%

CISA SSVC decision

Exploitation
active
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Google
9.2
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Oct 27, 2026. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Nov 10, 2026.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-111497

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
googlebrotli
googlewoff2
nodejsnode.js
python-hyperbrotlicffi
microsoft.net
debiandebian linux
istioistio
anthropicbun
envoyproxyenvoy
tianocoreedk2
duckdbduckdb
clickhouseclickhouse

and 14 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • 7-zip p7zipup to 16.02 inclusive
  • andybalholm brotlibefore 1.2.7
  • anthropic bunbefore 1.4.4
  • apache arrowup to 26.0.0 inclusive
  • apache arrow27.0.0
  • clickhouse clickhouseup to 26.10.2.103 inclusive
  • debian debian linux12.0
  • duckdb duckdbup to 2.0.0 inclusive
  • envoyproxy envoybefore 1.37.8
  • envoyproxy envoy1.39.0 and later · before 1.39.3
  • envoyproxy envoy1.38.0 and later · before 1.38.6
  • google brotli1.0.3 and later · before 1.0.10
  • google brotli1.1.0 and later · before 1.1.1
  • google brotli1.2.0 and later · before 1.2.1
  • google woff2all versions
  • istio istio1.30.0 and later · before 1.30.6
  • istio istiobefore 1.29.9
  • istio istio1.31.0 and later · before 1.31.2
  • mcmilk 7-zip-zstdup to 26.02-1.5.7-r2 inclusive
  • microsoft .net10.0.0 and later · before 10.0.14

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Google). Independent of NVD's CPE analysis and usually ahead of it.

  • Google Brotli

    • 1.0.3 and later · before 1.0.10affected · semver
    • 1.1.0 and later · before 1.1.1affected · semver
    • 1.2.0 and later · before 1.2.1affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10aspnetcore-runtime-8.0before 8.0.33-1.el10_28.0.33-1.el10_2
AlmaLinux:10aspnetcore-runtime-dbg-8.0before 8.0.33-1.el10_28.0.33-1.el10_2
AlmaLinux:10aspnetcore-targeting-pack-8.0before 8.0.33-1.el10_28.0.33-1.el10_2
AlmaLinux:10brotlibefore 1.1.0-8.el10_2.11.1.0-8.el10_2.1
AlmaLinux:10brotli-develbefore 1.1.0-8.el10_2.11.1.0-8.el10_2.1
AlmaLinux:10dotnet-apphost-pack-8.0before 8.0.33-1.el10_28.0.33-1.el10_2
AlmaLinux:10dotnet-hostfxr-8.0before 8.0.33-1.el10_28.0.33-1.el10_2
AlmaLinux:10dotnet-runtime-8.0before 8.0.33-1.el10_28.0.33-1.el10_2
AlmaLinux:10dotnet-runtime-dbg-8.0before 8.0.33-1.el10_28.0.33-1.el10_2
AlmaLinux:10dotnet-sdk-8.0before 8.0.133-1.el10_28.0.133-1.el10_2
AlmaLinux:10dotnet-sdk-8.0-source-built-artifactsbefore 8.0.133-1.el10_28.0.133-1.el10_2
AlmaLinux:10dotnet-sdk-dbg-8.0before 8.0.133-1.el10_28.0.133-1.el10_2
AlmaLinux:10dotnet-targeting-pack-8.0before 8.0.33-1.el10_28.0.33-1.el10_2
AlmaLinux:10dotnet-templates-8.0before 8.0.133-1.el10_28.0.133-1.el10_2
AlmaLinux:10libbrotlibefore 1.1.0-8.el10_2.11.1.0-8.el10_2.1
AlmaLinux:10python3-brotlibefore 1.1.0-8.el10_2.11.1.0-8.el10_2.1
AlmaLinux:8aspnetcore-runtime-8.0before 8.0.33-1.el8_108.0.33-1.el8_10
AlmaLinux:8aspnetcore-runtime-dbg-8.0before 8.0.33-1.el8_108.0.33-1.el8_10
AlmaLinux:8aspnetcore-targeting-pack-8.0before 8.0.33-1.el8_108.0.33-1.el8_10
AlmaLinux:8brotlibefore 1.0.6-5.el8_101.0.6-5.el8_10
AlmaLinux:8brotli-develbefore 1.0.6-5.el8_101.0.6-5.el8_10
AlmaLinux:8dotnet-apphost-pack-8.0before 8.0.33-1.el8_108.0.33-1.el8_10
AlmaLinux:8dotnet-hostfxr-8.0before 8.0.33-1.el8_108.0.33-1.el8_10
AlmaLinux:8dotnet-runtime-8.0before 8.0.33-1.el8_108.0.33-1.el8_10

+95

Same product

google: all records

Other highest-scoring records for the same primary product.

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Google Brotli1.0.10Vendor (CNA)
Google Brotli1.1.1Vendor (CNA)
Google Brotli1.2.1Vendor (CNA)
.NET 10.0 installed on Linux10.0.403 · KB5133966Microsoft (MSRC)
.NET 10.0 installed on Mac OS10.0.403 · KB5133966Microsoft (MSRC)
.NET 10.0 installed on Windows10.0.403 · KB5133966Microsoft (MSRC)
.NET 11.0 installed on Linux11.0.100-rc.3.26522.148 · Release NotesMicrosoft (MSRC)
.NET 11.0 installed on Mac OS11.0.100-rc.3.26522.148 · Release NotesMicrosoft (MSRC)
.NET 11.0 installed on Windows11.0.100-rc.3.26522.148 · Release NotesMicrosoft (MSRC)
.NET 8.0 installed on Linux8.0.427 · KB5133964Microsoft (MSRC)
.NET 8.0 installed on Mac OS8.0.427 · KB5133964Microsoft (MSRC)
.NET 8.0 installed on Windows8.0.427 · KB5133964Microsoft (MSRC)
.NET 9.0 installed on Linux9.0.320 · KB5133965Microsoft (MSRC)
.NET 9.0 installed on Mac OS9.0.320 · KB5133965Microsoft (MSRC)
.NET 9.0 installed on Windows9.0.320 · KB5133965Microsoft (MSRC)
azl3 brotli 1.1.0-2 on Azure Linux 3.01.2.1-1 · Release NotesMicrosoft (MSRC)
azl3 nodejs 24.21.0-1 on Azure Linux 3.024.22.1-1 · Release NotesMicrosoft (MSRC)
azl3 p7zip 16.02-23 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 qemu 10.1.0-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 qemu 10.1.0-2 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
Microsoft Visual Studio 2017 version 15.915.9.84 · Release NotesMicrosoft (MSRC)
Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)Release NotesMicrosoft (MSRC)
Microsoft Visual Studio 2019 version 16.1116.11.61 · Release NotesMicrosoft (MSRC)
Microsoft Visual Studio 2022 version 17.1417.14.43 · Release NotesMicrosoft (MSRC)
Microsoft Visual Studio 2026 version 18.1118.11.2 · Release NotesMicrosoft (MSRC)
Microsoft Visual Studio 2026 version 18.1218.12 Insiders 3 · Release NotesMicrosoft (MSRC)
PowerShell 7.47.4.22 · Release NotesMicrosoft (MSRC)
PowerShell 7.57.5.13 · Release NotesMicrosoft (MSRC)
PowerShell 7.67.6.9 · Release NotesMicrosoft (MSRC)
almalinux:brotli1.0.9-10.el9_8.1 · AlmaLinux:9Package registry (OSV)

+41

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Nuclei detection template ×2
  • Proof-of-concept repository on GitHub ×50

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Nuclei detection templateNuclei template CVE-2026-116366 —
Nuclei detection templateNuclei template CVE-2026-111497 —
Proof-of-concept repository on GitHubstars:172026-10-21
Proof-of-concept repository on GitHubstars:772026-10-22
Proof-of-concept repository on GitHubstars:12026-10-22
Proof-of-concept repository on GitHubstars:72026-10-22
Proof-of-concept repository on GitHubstars:12026-10-22
Proof-of-concept repository on GitHubstars:02026-10-22
Proof-of-concept repository on GitHubstars:02026-10-22
Proof-of-concept repository on GitHubstars:32026-10-22
Proof-of-concept repository on GitHubstars:62026-10-22
Proof-of-concept repository on GitHubstars:12026-10-23

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-2 d
  2. Published
  3. Fix recordedsame day
  4. CISA KEV+4 d
  5. TodayNov 7, 2026+16 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-252 · Unchecked Return Value

CVSS 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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitationnone → active
  2. Exploit maturitypoc → weaponized
  3. KEV✗ → ✓
  4. SSVC exploitationpoc → none
  5. SSVC exploitationnone → poc
  6. SSVC exploitation— → none
  7. Exploit maturity— → poc
  8. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records