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CVE-2026-111497

CRITICAL 9.2 DETECTION TEMPLATE

Published 2026-10-22 · Last modified 2026-10-26

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.

LIKELY TARGET

36.0% modeled chance of exploitation in the next 30 days (98th percentile). Prioritize remediation.

Exploitation likelihood

36.0%chance of exploitation in 30 days · 98th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

9.2CVSS 4.0 · CRITICAL

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable
  • ⚠Requirements: Specific conditions must be present

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Detection templates

Detection checks are listed separately from PoCs.

Resource commands

nuclei -id CVE-2026-111497 -u https://TARGETDetection template — review its checks and affected versions before use.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Google

Products Brotli

Weakness (CWE)

  • CWE-787: Out-of-bounds Write
  • 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

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • brotli PyPI

    pkg:pypi/brotli

    ECOSYSTEM range
    • Introduced version (included): 1.0.3
    • Fixed boundary (excluded): 1.2.1
    7 explicitly listed affected versions

    1.0.4, 1.0.6, 1.0.7, 1.0.8, 1.0.9, 1.1.0, 1.2.0

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-9v8h-qqgm-4m35/GHSA-9v8h-qqgm-4m35.json"
  }
}
    GitHub Advisory Database · GHSA-9v8h-qqgm-4m35 · Updated 2026-10-24T10:55:42.890666980Z
  • brotlicffi PyPI

    pkg:pypi/brotlicffi

    ECOSYSTEM range
    • Introduced version (included): 1.0.3
    • Fixed boundary (excluded): 1.2.1.0
    7 explicitly listed affected versions

    1.0.9.0, 1.0.9.1, 1.0.9.2, 1.1.0.0, 1.2.0.0, 1.2.0.1, 1.2.0.2

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-9v8h-qqgm-4m35/GHSA-9v8h-qqgm-4m35.json"
  }
}
    GitHub Advisory Database · GHSA-9v8h-qqgm-4m35 · Updated 2026-10-24T10:55:42.890666980Z
  • brotli PyPI

    pkg:pypi/brotli

    ECOSYSTEM range
    • All earlier versions (introduced 0)
    • Fixed boundary (excluded): 1.2.1
    10 explicitly listed affected versions

    0.5.2, 0.6.0, 1.0.1, 1.0.4, 1.0.6, 1.0.7, 1.0.8, 1.0.9, 1.1.0, 1.2.0

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/pypa/advisory-database/blob/main/vulns/brotli/PYSEC-2026-4322.yaml"
  }
}
    PyPA · PYSEC-2026-4322 · Updated 2026-10-24T10:55:42.890666980Z
  • brotlicffi PyPI

    pkg:pypi/brotlicffi

    ECOSYSTEM range
    • All earlier versions (introduced 0)
    • Fixed boundary (excluded): 1.2.1.0
    8 explicitly listed affected versions

    0.8.0, 1.0.9.0, 1.0.9.1, 1.0.9.2, 1.1.0.0, 1.2.0.0, 1.2.0.1, 1.2.0.2

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/pypa/advisory-database/blob/main/vulns/brotlicffi/PYSEC-2026-4323.yaml"
  }
}
    PyPA · PYSEC-2026-4323 · Updated 2026-10-24T10:55:42.890666980Z

Vendor product assessments

Showing 32 of 146 vendor product statements; 114 omitted. Read the full vendor advisory.

  • brotli-0:1.2.1-0.1.hum1@aarch64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: See the security bulletin for a detailed mitigation procedure.
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • brotli-0:1.2.1-0.1.hum1@s390x as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=s390x&distro=hummingbird-20251124&repository_id=public-hummingbird-s390x-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: See the security bulletin for a detailed mitigation procedure.
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • brotli-0:1.2.1-0.1.hum1@src as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=src&distro=hummingbird-20251124&repository_id=public-hummingbird-source-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: See the security bulletin for a detailed mitigation procedure.
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • brotli-devel-0:1.2.1-0.1.hum1@aarch64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: See the security bulletin for a detailed mitigation procedure.
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • brotli-devel-0:1.2.1-0.1.hum1@s390x as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=s390x&distro=hummingbird-20251124&repository_id=public-hummingbird-s390x-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: See the security bulletin for a detailed mitigation procedure.
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • brotli-devel-0:1.2.1-0.1.hum1@x86_64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=x86_64&distro=hummingbird-20251124&repository_id=public-hummingbird-x86_64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: See the security bulletin for a detailed mitigation procedure.
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • libbrotli-0:1.2.1-0.1.hum1@aarch64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: See the security bulletin for a detailed mitigation procedure.
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • libbrotli-0:1.2.1-0.1.hum1@s390x as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=s390x&distro=hummingbird-20251124&repository_id=public-hummingbird-s390x-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: See the security bulletin for a detailed mitigation procedure.
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • python3-brotli-0:1.2.1-0.1.hum1@aarch64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: See the security bulletin for a detailed mitigation procedure.
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • python3-brotli-0:1.2.1-0.1.hum1@s390x as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=s390x&distro=hummingbird-20251124&repository_id=public-hummingbird-s390x-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: See the security bulletin for a detailed mitigation procedure.
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • python3-brotli-0:1.2.1-0.1.hum1@x86_64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=x86_64&distro=hummingbird-20251124&repository_id=public-hummingbird-x86_64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: See the security bulletin for a detailed mitigation procedure.
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • exploit-intelligence/vulnerability-analysis-rhel9 as a component of Exploit Intelligence · known affected

    Vendor assessment for this product only.

    pkg:oci/vulnerability-analysis-rhel9?repository_url=registry.redhat.io/exploit-intelligence/vulnerability-analysis-rhel9

    • workaround: See the security bulletin for a detailed mitigation procedure.
    • none available: Affected
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • python3.11-brotli.src as a component of Red Hat Ansible Automation Platform 2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/python3.11-brotli?arch=src

    • workaround: See the security bulletin for a detailed mitigation procedure.
    • none available: Affected
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • firefox.src as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/firefox?arch=src

    • workaround: See the security bulletin for a detailed mitigation procedure.
    • none available: Affected
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • brotli as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/brotli

    • workaround: See the security bulletin for a detailed mitigation procedure.
    • none available: Affected
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • nodejs-libs (nodejs:24) as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs-libs?rpmmod=nodejs:24

    • workaround: See the security bulletin for a detailed mitigation procedure.
    • none available: Affected
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • npm (nodejs:24) as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/npm?rpmmod=nodejs:24

    • workaround: See the security bulletin for a detailed mitigation procedure.
    • none available: Affected
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • brotli-devel as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/brotli-devel

    • workaround: See the security bulletin for a detailed mitigation procedure.
    • none available: Affected
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • nodejs-docs (nodejs:26) as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs-docs?rpmmod=nodejs:26

    • workaround: See the security bulletin for a detailed mitigation procedure.
    • none available: Affected
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • nodejs (nodejs:26) as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/nodejs?rpmmod=nodejs:26

    • workaround: See the security bulletin for a detailed mitigation procedure.
    • none available: Affected
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • jbcs-httpd24-brotli.src as a component of Red Hat JBoss Core Services · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/jbcs-httpd24-brotli?arch=src

    • workaround: See the security bulletin for a detailed mitigation procedure.
    • none available: Affected
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • python-brotli.src as a component of Red Hat Update Infrastructure 4 for Cloud Providers · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/python-brotli?arch=src

    • workaround: See the security bulletin for a detailed mitigation procedure.
    • none available: Affected
    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • build-of-trustee/trustee-rhel9 as a component of Confidential Compute Attestation · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:oci/trustee-rhel9?repository_url=registry.redhat.io/build-of-trustee/trustee-rhel9

    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • goose.src as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/goose?arch=src

    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • nodejs-npm as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/nodejs-npm

    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • nodejs24-npm as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/nodejs24-npm

    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • mozjs60.src as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/mozjs60?arch=src

    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • nodejs-nodemon (nodejs:22) as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/nodejs-nodemon?rpmmod=nodejs:22

    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • npm (nodejs:22) as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/npm?rpmmod=nodejs:22

    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • nodejs-docs (nodejs:22) as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/nodejs-docs?rpmmod=nodejs:22

    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • rust.src as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/rust?arch=src

    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00
  • rhtpa/rhtpa-trustification-service-rhel9 as a component of Red Hat Trusted Profile Analyzer · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:oci/rhtpa-trustification-service-rhel9?repository_url=registry.redhat.io/rhtpa/rhtpa-trustification-service-rhel9

    Red Hat · CVE-2026-111497 · Updated 2026-10-26T11:02:50+00:00

Unverified PoC candidates

Catalogue matches for further research. These repositories have not been validated as working exploits.

46 candidates

All CVSS metrics

  • CRITICAL 9.2 v4.0 · CNA Primary
    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
  • CRITICAL 9.2 v4.0 · NVD Secondary
    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

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS