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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Brotli | stable – ≤ 1.0.7 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | brotli | 1.0.9-1 | — |
| Debian 13 | brotli | 1.0.9-1 | — |
| Debian 12 | brotli | 1.0.9-1 | — |
| Debian 10 | brotli | 1.0.7-2+deb10u1 | DSA-4801-1 |
| Debian 9 | brotli | 0.5.2+dfsg-2+deb9u1 | DLA-2476-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | brotli | 1.0.7-6ubuntu0.1 | USN-4568-1 |
| Ubuntu 18.04 LTS | brotli | 1.0.3-1ubuntu1.3 | USN-4568-1 |
| Ubuntu 16.04 LTS | brotli | 1.0.3-1ubuntu1~16.04.2 | USN-4568-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | brotli +2 | 1.0.6-3.el8 | RHSA-2021:1702 |
| RHEL 8 | dotnet-hostfxr-3.1 +5 | 3.1.23-1.el8_5 | RHSA-2022:0827 |
| RHEL 8 | dotnet-hostfxr-5.0 +5 | 5.0.15-1.el8_5 | RHSA-2022:0830 |
| RHEL 8 | dotnet3.1 +3 | 3.1.417-1.el8_5 | RHSA-2022:0827 |
| RHEL 8 | dotnet5.0 +3 | 5.0.212-1.el8_5 | RHSA-2022:0830 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhel Dotnet 5 | rh-dotnet50-dotnet +4 | 5.0.212-1.el7_9 | RHSA-2022:0828 |
| Red Hat Rhel Dotnet 5 | rh-dotnet50-dotnet-host +6 | 5.0.15-1.el7_9 | RHSA-2022:0828 |
| Red Hat Rhel Dotnet 3 | rh-dotnet31-dotnet +4 | 3.1.417-1.el7_9 | RHSA-2022:0829 |
| Red Hat Rhel Dotnet 3 | rh-dotnet31-dotnet-host +6 | 3.1.23-1.el7_9 | RHSA-2022:0829 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | brotli +2 | 1.0.6-3.el8 | ALSA-2021:1702 |
| AlmaLinux 8 | dotnet-hostfxr-3.1 +5 | 3.1.23-1.el8_5 | ALSA-2022:0827 |
| AlmaLinux 8 | dotnet-hostfxr-5.0 +5 | 5.0.15-1.el8_5 | ALSA-2022:0830 |
| AlmaLinux 8 | dotnet-sdk-3.1 +2 | 3.1.417-1.el8_5 | ALSA-2022:0827 |
| AlmaLinux 8 | dotnet-sdk-5.0 +2 | 5.0.212-1.el8_5 | ALSA-2022:0830 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | brotli | 1.0.6-3.el8 | RLSA-2021:1702 |
| Rocky Linux 8 | dotnet3.1 | 3.1.417-1.el8_5 | RLSA-2022:0827 |
| Rocky Linux 8 | dotnet5.0 | 5.0.212-1.el8_5 | RLSA-2022:0830 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | python-Brotli | 1.0.7-150200.3.3.1 | SUSE-SU-2024:1968-1 |
| SLES 15 SP5 | python-brotlipy | 0.7.0-150300.3.3.1 | SUSE-SU-2023:3827-1 |
| SLES 15 SP4 | python-brotlipy | 0.7.0-150300.3.3.1 | SUSE-SU-2023:3827-1 |
| SLES 15 SP3 | brotli | 1.0.7-3.3.1 | SUSE-SU-2021:3942-1 |
| SLES 15 SP3 | python-brotlipy | 0.7.0-150300.3.3.1 | SUSE-SU-2023:3827-1 |
| SLES 15 SP2 | brotli | 1.0.7-3.3.1 | SUSE-SU-2021:3942-1 |
| SLES 15 SP2 | python-brotlipy | 0.7.0-150100.3.6.1 | SUSE-SU-2023:3669-1 |
| SLES 15 SP1 | python-brotlipy | 0.7.0-150100.3.6.1 | SUSE-SU-2023:3669-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | python-brotlipy | 0.6.0-2.6.1 | SUSE-SU-2023:3670-1 |
| SLES 3 | python-Brotli | 1.0.7-150200.3.3.1 | SUSE-SU-2024:1968-1 |
| SLE Micro 5.1 | brotli | 1.0.7-3.3.1 | SUSE-SU-2025:01762-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | cargo-audit-advisory-db | 20220105-1.1 | openSUSE-SU-2024:11708-1 |
| openSUSE Tumbleweed | python-Brotli | 1.2.0-1.6 | openSUSE-SU-2026:11988-1 |
| openSUSE Leap 15.5 | python-Brotli | 1.0.7-150200.3.3.1 | SUSE-SU-2024:1968-1 |
| openSUSE Leap 15.5 | python-brotlipy | 0.7.0-150300.3.3.1 | SUSE-SU-2023:3827-1 |
| openSUSE Leap 15.4 | python-brotlipy | 0.7.0-150300.3.3.1 | SUSE-SU-2023:3827-1 |
| openSUSE Leap 15.3 | brotli | 1.0.7-3.3.1 | openSUSE-SU-2021:3942-1 |
| openSUSE Leap 15.2 | brotli | 1.0.9-lp152.2.3.1 | openSUSE-SU-2020:1578-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | brotli | 1.0.9-r0 | — |
| Alpine v3.23 | brotli | 1.0.9-r0 | — |
| Alpine v3.22 | brotli | 1.0.9-r0 | — |
| Alpine v3.21 | brotli | 1.0.9-r0 | — |
| Alpine v3.20 | brotli | 1.0.9-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | brotli | 1.0.9-r0 | — |
| Alpine v3.18 | brotli | 1.0.9-r0 | — |
| Alpine v3.17 | brotli | 1.0.9-r0 | — |
| Alpine v3.16 | brotli | 1.0.9-r0 | — |
| Alpine v3.15 | brotli | 1.0.9-r0 | — |
| Alpine v3.14 | brotli | 1.0.9-r0 | — |
| Alpine v3.13 | brotli | 1.0.9-r0 | — |
| Alpine v3.12 | brotli | 1.0.9-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | brotli | 1.0.7-10 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | brotli +2 | 1.0.6-3.el8 | ELSA-2021-1702 |
| Oracle Linux 8 | dotnet-hostfxr-3.1 +5 | 3.1.23-1.0.1.el8_5 | ELSA-2022-0827 |
| Oracle Linux 8 | dotnet-hostfxr-5.0 +5 | 5.0.15-1.0.1.el8_5 | ELSA-2022-0830 |
| Oracle Linux 8 | dotnet-sdk-3.1 +2 | 3.1.417-1.0.1.el8_5 | ELSA-2022-0827 |
| Oracle Linux 8 | dotnet-sdk-5.0 +2 | 5.0.212-1.0.1.el8_5 | ELSA-2022-0830 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
federiconbaez/cortex9-brotli-uncompressed-copy-narrowing-model ★ 0 · Nov 9, 2026
Offline arithmetic model of the size_t-to-int narrowing in Brotli's uncompressed block copy (CVE-2020-8927). Arithmetic only: no input read, nothing decompressed.
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 29
- ALSA-2022:0827 Important: .NET Core 3.1 security and bugfix update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2022:0830 Important: .NET 5.0 security and bugfix update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2021:1702 Moderate: brotli security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2025-1170 Red Hat Enterprise Linux (Brotli): Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Oct 11, 2026
- openSUSE-SU-2026:11988-1 python313-Brotli-1.2.0-1.6 on GA media SUSE / openSUSE Security Updates · Oct 5, 2026
- WID-SEC-2025-0227 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- RHSA-2021:1702 Red Hat Security Advisory: brotli security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2022:0827 Red Hat Security Advisory: .NET Core 3.1 security and bugfix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2022:0830 Red Hat Security Advisory: .NET 5.0 security and bugfix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2022:0828 Red Hat Security Advisory: .NET 5.0 on RHEL 7 security and bugfix update Red Hat Security Advisories (RHSA) · May 28, 2026
- RHSA-2022:0829 Red Hat Security Advisory: .NET Core 3.1 on RHEL 7 security and bugfix update Red Hat Security Advisories (RHSA) · May 28, 2026
- USN-4568-1 brotli vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4801-1 brotli - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2476-1 brotli - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:1702 Moderate: brotli security update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2022:0827 Important: .NET Core 3.1 security and bugfix update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2022:0830 Important: .NET 5.0 security and bugfix update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2020:1578-1 Security update for brotli SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:01762-1 Security update for brotli SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3942-1 Security update for brotli SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3827-1 Security update for python-brotlipy SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1968-1 Security update for python-Brotli SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11708-1 cargo-audit-advisory-db-20220105-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:3942-1 Security update for brotli SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3670-1 Security update for python-brotlipy SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2023:3669-1 Security update for python-brotlipy SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2022-0827 Important: .NET Core 3.1 security and bugfix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 11, 2022
- ELSA-2022-0830 Important: .NET 5.0 security and bugfix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 11, 2022
- ELSA-2021-1702 Moderate: brotli security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 25, 2021
References
- https://github.com/google/brotli/releases/tag/v1.0.9
- openSUSE-SU-2020:1578 vendor-advisory
- FEDORA-2020-22d278923a vendor-advisory
- USN-4568-1 vendor-advisory
- FEDORA-2020-c663fbc46c vendor-advisory
- FEDORA-2020-e21bd401ad vendor-advisory
- FEDORA-2020-bc9a739f0c vendor-advisory
- FEDORA-2020-9336b65f82 vendor-advisory
- FEDORA-2020-c76a35b209 vendor-advisory
- [debian-lts-announce] 20201201 [SECURITY] [DLA 2476-1] brotli security update mailing-list
- DSA-4801 vendor-advisory
- FEDORA-2022-9e046f579a vendor-advisory
- FEDORA-2022-5ecee47acb vendor-advisory
- FEDORA-2022-d28042f559 vendor-advisory