# CVE-2020-8927: Brotli Library Buffer Overflow Vulnerability

CVE-2020-8927 is fixed in 28 products on 2 platforms, first by brotli 1.0.3-1ubuntu1.3, released September 15, 2020. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2020-8927
- Priority: Urgent
- CVSS: 7.5 (Important)
- EPSS: 0.0322
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation More Likely
- Published: Sep 15, 2020
- Weakness: CWE-130: Improper Handling of Length Parameter Inconsistency
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-8927

## Description

A buffer overflow exists in the Brotli library versions prior to 1.0.8 where an attacker controlling the input length of a "one-shot" decompression request to a script can trigger a crash, which happens when copying over chunks of data larger than 2 GiB. It is recommended to update your Brotli library to 1.0.8 or later. If one cannot update, we recommend to use the "streaming" API as opposed to the "one-shot" API, and impose chunk size limits.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | PowerShell | 7.2.2.0 | [PowerShell 7.2.2.0](https://patchblox.com/security/data/fix/windows-app/microsoft.powershell-7.2.2.0.md) | Mar 16, 2022 |
| Windows apps | PowerShell Preview | 7.3.0.1 | [PowerShell Preview 7.3.0.1](https://patchblox.com/security/data/fix/windows-app/microsoft.powershell.preview-7.3.0.1.md) | Dec 16, 2021 |
| Linux | aspnetcore-runtime-3.1 RHEL 8 | 0:3.1.23-1.el8_5 | [RHSA-2022:0827](https://patchblox.com/security/data/fix/linux/rhsa-2022-0827.md) | Mar 10, 2022 |
| Linux | aspnetcore-runtime-3.1 almalinux 8 | 3.1.23-1.el8_5 | [ALSA-2022:0827](https://patchblox.com/security/data/fix/linux/alsa-2022-0827.md) | Mar 10, 2022 |
| Linux | aspnetcore-runtime-3.1 ol 8 | 0:3.1.23-1.0.1.el8_5 | [ELSA-2022-0827](https://patchblox.com/security/data/fix/linux/elsa-2022-0827.md) | Mar 11, 2022 |
| Linux | aspnetcore-runtime-5.0 RHEL 8 | 0:5.0.15-1.el8_5 | [RHSA-2022:0830](https://patchblox.com/security/data/fix/linux/rhsa-2022-0830.md) | Mar 10, 2022 |
| Linux | aspnetcore-runtime-5.0 almalinux 8 | 5.0.15-1.el8_5 | [ALSA-2022:0830](https://patchblox.com/security/data/fix/linux/alsa-2022-0830.md) | Mar 10, 2022 |
| Linux | aspnetcore-runtime-5.0 ol 8 | 0:5.0.15-1.0.1.el8_5 | [ELSA-2022-0830](https://patchblox.com/security/data/fix/linux/elsa-2022-0830.md) | Mar 11, 2022 |
| Linux | aspnetcore-targeting-pack-3.1 RHEL 8 | 0:3.1.23-1.el8_5 | [RHSA-2022:0827](https://patchblox.com/security/data/fix/linux/rhsa-2022-0827.md) | Mar 10, 2022 |
| Linux | aspnetcore-targeting-pack-3.1 almalinux 8 | 3.1.23-1.el8_5 | [ALSA-2022:0827](https://patchblox.com/security/data/fix/linux/alsa-2022-0827.md) | Mar 10, 2022 |
| Linux | aspnetcore-targeting-pack-3.1 ol 8 | 0:3.1.23-1.0.1.el8_5 | [ELSA-2022-0827](https://patchblox.com/security/data/fix/linux/elsa-2022-0827.md) | Mar 11, 2022 |
| Linux | aspnetcore-targeting-pack-5.0 RHEL 8 | 0:5.0.15-1.el8_5 | [RHSA-2022:0830](https://patchblox.com/security/data/fix/linux/rhsa-2022-0830.md) | Mar 10, 2022 |
| Linux | aspnetcore-targeting-pack-5.0 almalinux 8 | 5.0.15-1.el8_5 | [ALSA-2022:0830](https://patchblox.com/security/data/fix/linux/alsa-2022-0830.md) | Mar 10, 2022 |
| Linux | aspnetcore-targeting-pack-5.0 ol 8 | 0:5.0.15-1.0.1.el8_5 | [ELSA-2022-0830](https://patchblox.com/security/data/fix/linux/elsa-2022-0830.md) | Mar 11, 2022 |
| Linux | brotli RHEL 8 | 0:1.0.6-3.el8 | [RHSA-2021:1702](https://patchblox.com/security/data/fix/linux/rhsa-2021-1702.md) | May 18, 2021 |
| Linux | brotli Ubuntu 18.04.6 LTS (bionic) | 1.0.3-1ubuntu1.3 | [brotli 1.0.3-1ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-brotli-1.0.3-1ubuntu1.3.md) | Sep 15, 2020 |
| Linux | brotli Ubuntu 20.04 LTS (focal) | 1.0.7-6ubuntu0.1 | [brotli 1.0.7-6ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-brotli-1.0.7-6ubuntu0.1.md) | Sep 15, 2020 |
| Linux | brotli ol 8 | 0:1.0.6-3.el8 | [ELSA-2021-1702](https://patchblox.com/security/data/fix/linux/elsa-2021-1702.md) | May 25, 2021 |
| Linux | brotli-devel RHEL 8 | 0:1.0.6-3.el8 | [RHSA-2021:1702](https://patchblox.com/security/data/fix/linux/rhsa-2021-1702.md) | May 18, 2021 |
| Linux | brotli-devel ol 8 | 0:1.0.6-3.el8 | [ELSA-2021-1702](https://patchblox.com/security/data/fix/linux/elsa-2021-1702.md) | May 25, 2021 |
| Linux | dotnet-apphost-pack-3.1 RHEL 8 | 0:3.1.23-1.el8_5 | [RHSA-2022:0827](https://patchblox.com/security/data/fix/linux/rhsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet-apphost-pack-3.1 almalinux 8 | 3.1.23-1.el8_5 | [ALSA-2022:0827](https://patchblox.com/security/data/fix/linux/alsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet-apphost-pack-3.1 ol 8 | 0:3.1.23-1.0.1.el8_5 | [ELSA-2022-0827](https://patchblox.com/security/data/fix/linux/elsa-2022-0827.md) | Mar 11, 2022 |
| Linux | dotnet-apphost-pack-5.0 RHEL 8 | 0:5.0.15-1.el8_5 | [RHSA-2022:0830](https://patchblox.com/security/data/fix/linux/rhsa-2022-0830.md) | Mar 10, 2022 |
| Linux | dotnet-apphost-pack-5.0 almalinux 8 | 5.0.15-1.el8_5 | [ALSA-2022:0830](https://patchblox.com/security/data/fix/linux/alsa-2022-0830.md) | Mar 10, 2022 |
| Linux | dotnet-apphost-pack-5.0 ol 8 | 0:5.0.15-1.0.1.el8_5 | [ELSA-2022-0830](https://patchblox.com/security/data/fix/linux/elsa-2022-0830.md) | Mar 11, 2022 |
| Linux | dotnet-hostfxr-3.1 RHEL 8 | 0:3.1.23-1.el8_5 | [RHSA-2022:0827](https://patchblox.com/security/data/fix/linux/rhsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet-hostfxr-3.1 almalinux 8 | 3.1.23-1.el8_5 | [ALSA-2022:0827](https://patchblox.com/security/data/fix/linux/alsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet-hostfxr-3.1 ol 8 | 0:3.1.23-1.0.1.el8_5 | [ELSA-2022-0827](https://patchblox.com/security/data/fix/linux/elsa-2022-0827.md) | Mar 11, 2022 |
| Linux | dotnet-hostfxr-5.0 RHEL 8 | 0:5.0.15-1.el8_5 | [RHSA-2022:0830](https://patchblox.com/security/data/fix/linux/rhsa-2022-0830.md) | Mar 10, 2022 |
| Linux | dotnet-hostfxr-5.0 almalinux 8 | 5.0.15-1.el8_5 | [ALSA-2022:0830](https://patchblox.com/security/data/fix/linux/alsa-2022-0830.md) | Mar 10, 2022 |
| Linux | dotnet-hostfxr-5.0 ol 8 | 0:5.0.15-1.0.1.el8_5 | [ELSA-2022-0830](https://patchblox.com/security/data/fix/linux/elsa-2022-0830.md) | Mar 11, 2022 |
| Linux | dotnet-runtime-3.1 RHEL 8 | 0:3.1.23-1.el8_5 | [RHSA-2022:0827](https://patchblox.com/security/data/fix/linux/rhsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet-runtime-3.1 almalinux 8 | 3.1.23-1.el8_5 | [ALSA-2022:0827](https://patchblox.com/security/data/fix/linux/alsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet-runtime-3.1 ol 8 | 0:3.1.23-1.0.1.el8_5 | [ELSA-2022-0827](https://patchblox.com/security/data/fix/linux/elsa-2022-0827.md) | Mar 11, 2022 |
| Linux | dotnet-runtime-5.0 RHEL 8 | 0:5.0.15-1.el8_5 | [RHSA-2022:0830](https://patchblox.com/security/data/fix/linux/rhsa-2022-0830.md) | Mar 10, 2022 |
| Linux | dotnet-runtime-5.0 almalinux 8 | 5.0.15-1.el8_5 | [ALSA-2022:0830](https://patchblox.com/security/data/fix/linux/alsa-2022-0830.md) | Mar 10, 2022 |
| Linux | dotnet-runtime-5.0 ol 8 | 0:5.0.15-1.0.1.el8_5 | [ELSA-2022-0830](https://patchblox.com/security/data/fix/linux/elsa-2022-0830.md) | Mar 11, 2022 |
| Linux | dotnet-sdk-3.1 RHEL 8 | 0:3.1.417-1.el8_5 | [RHSA-2022:0827](https://patchblox.com/security/data/fix/linux/rhsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet-sdk-3.1 almalinux 8 | 3.1.417-1.el8_5 | [ALSA-2022:0827](https://patchblox.com/security/data/fix/linux/alsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet-sdk-3.1 ol 8 | 0:3.1.417-1.0.1.el8_5 | [ELSA-2022-0827](https://patchblox.com/security/data/fix/linux/elsa-2022-0827.md) | Mar 11, 2022 |
| Linux | dotnet-sdk-3.1-source-built-artifacts RHEL 8 | 0:3.1.417-1.el8_5 | [RHSA-2022:0827](https://patchblox.com/security/data/fix/linux/rhsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet-sdk-3.1-source-built-artifacts almalinux 8 | 3.1.417-1.el8_5 | [ALSA-2022:0827](https://patchblox.com/security/data/fix/linux/alsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet-sdk-3.1-source-built-artifacts ol 8 | 0:3.1.417-1.0.1.el8_5 | [ELSA-2022-0827](https://patchblox.com/security/data/fix/linux/elsa-2022-0827.md) | Mar 11, 2022 |
| Linux | dotnet-sdk-5.0 RHEL 8 | 0:5.0.212-1.el8_5 | [RHSA-2022:0830](https://patchblox.com/security/data/fix/linux/rhsa-2022-0830.md) | Mar 10, 2022 |
| Linux | dotnet-sdk-5.0 almalinux 8 | 5.0.212-1.el8_5 | [ALSA-2022:0830](https://patchblox.com/security/data/fix/linux/alsa-2022-0830.md) | Mar 10, 2022 |
| Linux | dotnet-sdk-5.0 ol 8 | 0:5.0.212-1.0.1.el8_5 | [ELSA-2022-0830](https://patchblox.com/security/data/fix/linux/elsa-2022-0830.md) | Mar 11, 2022 |
| Linux | dotnet-sdk-5.0-source-built-artifacts RHEL 8 | 0:5.0.212-1.el8_5 | [RHSA-2022:0830](https://patchblox.com/security/data/fix/linux/rhsa-2022-0830.md) | Mar 10, 2022 |
| Linux | dotnet-sdk-5.0-source-built-artifacts almalinux 8 | 5.0.212-1.el8_5 | [ALSA-2022:0830](https://patchblox.com/security/data/fix/linux/alsa-2022-0830.md) | Mar 10, 2022 |
| Linux | dotnet-sdk-5.0-source-built-artifacts ol 8 | 0:5.0.212-1.0.1.el8_5 | [ELSA-2022-0830](https://patchblox.com/security/data/fix/linux/elsa-2022-0830.md) | Mar 11, 2022 |
| Linux | dotnet-targeting-pack-3.1 RHEL 8 | 0:3.1.23-1.el8_5 | [RHSA-2022:0827](https://patchblox.com/security/data/fix/linux/rhsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet-targeting-pack-3.1 almalinux 8 | 3.1.23-1.el8_5 | [ALSA-2022:0827](https://patchblox.com/security/data/fix/linux/alsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet-targeting-pack-3.1 ol 8 | 0:3.1.23-1.0.1.el8_5 | [ELSA-2022-0827](https://patchblox.com/security/data/fix/linux/elsa-2022-0827.md) | Mar 11, 2022 |
| Linux | dotnet-targeting-pack-5.0 RHEL 8 | 0:5.0.15-1.el8_5 | [RHSA-2022:0830](https://patchblox.com/security/data/fix/linux/rhsa-2022-0830.md) | Mar 10, 2022 |
| Linux | dotnet-targeting-pack-5.0 almalinux 8 | 5.0.15-1.el8_5 | [ALSA-2022:0830](https://patchblox.com/security/data/fix/linux/alsa-2022-0830.md) | Mar 10, 2022 |
| Linux | dotnet-targeting-pack-5.0 ol 8 | 0:5.0.15-1.0.1.el8_5 | [ELSA-2022-0830](https://patchblox.com/security/data/fix/linux/elsa-2022-0830.md) | Mar 11, 2022 |
| Linux | dotnet-templates-3.1 RHEL 8 | 0:3.1.417-1.el8_5 | [RHSA-2022:0827](https://patchblox.com/security/data/fix/linux/rhsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet-templates-3.1 almalinux 8 | 3.1.417-1.el8_5 | [ALSA-2022:0827](https://patchblox.com/security/data/fix/linux/alsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet-templates-3.1 ol 8 | 0:3.1.417-1.0.1.el8_5 | [ELSA-2022-0827](https://patchblox.com/security/data/fix/linux/elsa-2022-0827.md) | Mar 11, 2022 |
| Linux | dotnet-templates-5.0 RHEL 8 | 0:5.0.212-1.el8_5 | [RHSA-2022:0830](https://patchblox.com/security/data/fix/linux/rhsa-2022-0830.md) | Mar 10, 2022 |
| Linux | dotnet-templates-5.0 almalinux 8 | 5.0.212-1.el8_5 | [ALSA-2022:0830](https://patchblox.com/security/data/fix/linux/alsa-2022-0830.md) | Mar 10, 2022 |
| Linux | dotnet-templates-5.0 ol 8 | 0:5.0.212-1.0.1.el8_5 | [ELSA-2022-0830](https://patchblox.com/security/data/fix/linux/elsa-2022-0830.md) | Mar 11, 2022 |
| Linux | dotnet3.1 rocky 8 | 0:3.1.417-1.el8_5 | [RLSA-2022:0827](https://patchblox.com/security/data/fix/linux/rlsa-2022-0827.md) | Mar 10, 2022 |
| Linux | dotnet5.0 rocky 8 | 0:5.0.212-1.el8_5 | [RLSA-2022:0830](https://patchblox.com/security/data/fix/linux/rlsa-2022-0830.md) | Mar 10, 2022 |
| Linux | libbrotli1 Ubuntu 18.04.6 LTS (bionic) | 1.0.3-1ubuntu1.3 | [libbrotli1 1.0.3-1ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libbrotli1-1.0.3-1ubuntu1.3.md) | Sep 15, 2020 |
| Linux | libbrotli1 Ubuntu 20.04 LTS (focal) | 1.0.7-6ubuntu0.1 | [libbrotli1 1.0.7-6ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libbrotli1-1.0.7-6ubuntu0.1.md) | Sep 15, 2020 |
| Linux | python-Brotli sles 15.6 | 1.0.7-150200.3.3.1 | [SUSE-SU-2024:1968-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-1968-1.md) | Jun 10, 2024 |
| Linux | python-brotli Ubuntu 18.04.6 LTS (bionic) | 1.0.3-1ubuntu1.3 | [python-brotli 1.0.3-1ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-brotli-1.0.3-1ubuntu1.3.md) | Sep 15, 2020 |
| Linux | python3-brotli RHEL 8 | 0:1.0.6-3.el8 | [RHSA-2021:1702](https://patchblox.com/security/data/fix/linux/rhsa-2021-1702.md) | May 18, 2021 |
| Linux | python3-brotli Ubuntu 18.04.6 LTS (bionic) | 1.0.3-1ubuntu1.3 | [python3-brotli 1.0.3-1ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python3-brotli-1.0.3-1ubuntu1.3.md) | Sep 15, 2020 |
| Linux | python3-brotli Ubuntu 20.04 LTS (focal) | 1.0.7-6ubuntu0.1 | [python3-brotli 1.0.7-6ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-brotli-1.0.7-6ubuntu0.1.md) | Sep 15, 2020 |
| Linux | python3-brotli ol 8 | 0:1.0.6-3.el8 | [ELSA-2021-1702](https://patchblox.com/security/data/fix/linux/elsa-2021-1702.md) | May 25, 2021 |

---

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