CVE-2026-111497 (GCVE-0-2026-111497)
Vulnerability from cvelistv5 – Published: 2026-10-22 13:35 – Updated: 2026-11-10 12:50Title
Out-of-Bounds Write in Google Brotli Decoder
Summary
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.
Severity
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-23 00:00 UTC
Assigner
References
24 references
Impacted products
76 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Brotli |
Affected:
1.0.3 , < 1.0.10
(semver)
Affected: 1.1.0 , < 1.1.1 (semver) Affected: 1.2.0 , < 1.2.1 (semver) |
guessed | ||
| Siemens | Calibre |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | Calibre ICE |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | Capital |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | Cloud Connector Configurator |
Affected:
0 , < V1.24.3
(custom)
|
guessed | |
| Siemens | Common Configurator (CC on IEM) |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Common Configurator on Device (CC on Edge) |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | COMOS Walkinside |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Data Flow Monitoring |
Affected:
0 , < V3.0.18
(custom)
|
guessed | |
| Siemens | Databus Configurator |
Affected:
0 , < V4.0.1
(custom)
|
guessed | |
| Siemens | DataXess Configurator |
Affected:
0 , < V1.5.7
(custom)
|
guessed | |
| Siemens | Designcenter X Essentials |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | Desigo CC family V8 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Desigo CC family V9 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Edge OPC UA Server Configurator |
Affected:
0 , < V2.3.10
(custom)
|
guessed | |
| Siemens | Flow Creator Configurator |
Affected:
0 , < V1.15.1
(custom)
|
guessed | |
| Siemens | gDAP (gPROMS Digital Application Platform) |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | Gridscale X DSA |
Affected:
V5.3 , < V5.4
(custom)
|
guessed | |
| Siemens | Gridscale X PSS®E |
Affected:
0 , < V36.8.0
(custom)
|
guessed | |
| Siemens | Heliox Dual Port 60kW |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | Heliox Flex Pro |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | HyperLynx |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Industrial Edge Hub |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Industrial Edge Management Cloud |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Innexis Architecture Native Acceleration 2026 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Insights Hub |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Opcenter Connect Electronics |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Opcenter Connect MOM |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Opcenter Execution Core |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Opcenter Execution Discrete |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Opcenter Execution Foundation |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Opcenter Execution Pharma |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Opcenter Execution Process |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Opcenter Intelligence |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Opcenter Intra Plant Logistics |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Opcenter Quality |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Opcenter RDnL |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Opcenter X |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | PADS Pro Essentials |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | PADS Pro Student Edition |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | PADS Professional |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Pathway to Learning Engineering |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | PAVE360 Automotive 2026 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Polarion |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | Process Preparation X |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Project Server Web Administration Tool |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SICHARGE FLEX |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | SICHARGE UC |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | Sifinity Go |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | Sifinity Setup |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC BRAUMAT |
Affected:
V8.2 Update 1 , < V8.2 Update 5
(custom)
|
guessed | |
| Siemens | SIMATIC Profiling Tool |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC SISTAR |
Affected:
V8.2 Update 1 , < V8.2 Update 5
(custom)
|
guessed | |
| Siemens | SIMATIC WinCC Companion |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC WinCC OA V3.20 |
Affected:
0 , < V3.20 P17.1
(custom)
|
guessed | |
| Siemens | SIMATIC WinCC OA V3.21 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC WinCC Runtime Professional |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC WinCC Unified for Industrial Edge |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC WinCC Unified PC Runtime |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC WinCC Unified SIQENCE |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC WinCC V7/V8 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Simcenter Executable Digital Twin |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Simcenter Studio |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Solid Edge |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | Teamcenter Share |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | Teamcenter V2412 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Teamcenter V2506 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Teamcenter V2512 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Teamcenter V2606 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | TIA Administrator |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | User Management Component (UMC) |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | VersiCharge AC Series |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | VersiCloud |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | Xpedition Designer |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | Xpedition Enterprise |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | RUGGEDCOM APE1808 |
Affected:
0 , < *
(custom)
|
guessed |
Date Public
2026-02-27 07:50
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 3b78c4fd-8b0b-488a-9561-67fe614507ef
Exploited: Yes
Timestamps
First Seen: 2026-10-27
Asserted: 2026-10-27
Scope
Notes: Google Brotli Unchecked Return Value Vulnerability | Affected: Google / Brotli | Description: Google Brotli contains an unchecked return value vulnerability that 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. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. | Due date: 2026-11-10 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/google/brotli/releases/tag/v1.2.1 ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-111497
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-252 CWE-787 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Brotli |
| Due Date | 2026-11-10 |
| Date Added | 2026-10-27 |
| Vendorproject | |
| Vulnerabilityname | Google Brotli Unchecked Return Value Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-10-27 20:00 UTC
| Updated: 2026-10-27 20:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 5e391e1f-e4c6-4180-8825-14998c1c2429
Exploited: Yes
Timestamps
First Seen: 2026-10-27
Asserted: 2026-10-27
Scope
Notes: Out-of-Bounds Write in Google Brotli Decoder | Affected: Google / Brotli | CVSS: 9.2 (CRITICAL) | EPSS: 0.82641 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | Out-of-Bounds Write in Google Brotli Decoder |
| Cve Id | CVE-2026-111497 |
| Vendor | |
| Ghsa Id | GHSA-9V8H-QQGM-4M35 |
| Product | Brotli |
| Added Date | 2026-10-27T20:05:08.466Z |
| Cvss Score | 9.2 |
| Epss Score | 0.82641 |
| Previous Ids | |
| Cvss Severity | CRITICAL |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.99667 |
| Used In Malware | unknown |
| Vulnerability Id | CVE-2026-111497 |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-28 21:00 UTC
| Updated: 2026-11-04 13:01 UTC
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"vendor": "Siemens",
"versions": [
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"version": "0",
"versionType": "custom"
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"vendor": "Siemens",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "Opcenter Connect MOM",
"vendor": "Siemens",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
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"defaultStatus": "unknown",
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"versionType": "custom"
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"defaultStatus": "unknown",
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Solutions
CNA · Google
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.
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.