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CVE-2020-8927

Buffer overflow in Brotli library

MEDIUM
6.5
CVSS Score
Published: September 15, 2020 at 09:15 AM UTC
Updated: June 17, 2026 at 03:27 AM UTC
10 products affected across 6 vendorsDebian LinuxFedoraUbuntu Linux

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Severity
MEDIUM6.5
Exploit prediction
EPSS 3%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ubuntu Linux· Canonicalrubygems
95%
16.0418.0420.04
Debian Linux· Debiandrupal
95%
10.09.0
Fedora· Fedora Projectrpm
95%
313233343536
Brotli· Google
95%
v < 1.0.8stable ≤ v ≤ 1.0.7stable
Affected range stops below 1.0.8, so it looks safe — our inference, not a vendor statement
.net· Microsoft
95%
5.0 ≤ v ≤ 5.0.14
.NET Core· Microsoft
95%
3.1 ≤ v ≤ 3.1.22
PowerShell· Microsoft
95%
7.0 ≤ v < 7.0.97.1 ≤ v < 7.1.67.2 ≤ v < 7.2.2
Affected range stops below 7.0.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.1.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.2.2, so it looks safe — our inference, not a vendor statement
Visual Studio 2019· Microsoft
95%
16.0 ≤ v ≤ 16.11
Visual Studio 2022· Microsoft
95%
17.0 ≤ v ≤ 17.0.717.1
Leap· openSUSEdrupal
95%
15.2

References (14)

Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00108.html
x_refsource_CONFIRMRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/google/brotli/releases/tag/v1.0.9
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2020/12/msg00003.html
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/356JOYTWW4BWSZ42SEFLV7NYHL3S3AEH/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4TOGTZ2ZWDH662ZNFFSZVL3M5AJXV6JF/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J4E265WKWKYMK2RYYSIXBEGZTDY5IQE6/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M4VCDOJGL6BK3HB4XRD2WETBPYX2ITF6/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MMBKACMLSRX7JJSKBTR35UOEP2WFR6QP/

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-130CWE-120

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