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CVE-2020-36846

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Date: May 29, 2025

A buffer overflow, as described in CVE-2020-8927, exists in the embedded Brotli library.  Versions of IO::Compress::Brotli prior to 0.007 included a version of the brotli library prior to version 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 IO::Compress::Brotli module to 0.007 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.

Severity Score

Related Resources (37)

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZXEQ3GQVELA2T4HNZG7VPMS2HDVXMJRG
https://nvd.nist.gov/vuln/detail/CVE-2020-8927
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/356JOYTWW4BWSZ42SEFLV7NYHL3S3AEH/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WW62OZEY2GHJL4JCOLJRBSRETXDHMWRK/
https://crates.io/crates/brotli-sys
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M4VCDOJGL6BK3HB4XRD2WETBPYX2ITF6/
https://github.com/bitemyapp/brotli2-rs
https://nvd.nist.gov/vuln/detail/CVE-2020-36846
https://github.com/google/brotli/releases/tag/v1.0.8
https://github.com/google/brotli/releases/tag/v1.0.9
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/356JOYTWW4BWSZ42SEFLV7NYHL3S3AEH
https://github.com/google/brotli/commit/223d80cfbec8fd346e32906c732c8ede21f0cea6
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00108.html
https://www.debian.org/security/2020/dsa-4801
https://rustsec.org/advisories/RUSTSEC-2021-0131.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/W23CUADGMVMQQNFKHPHXVP7RPZJZNN6I
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MMBKACMLSRX7JJSKBTR35UOEP2WFR6QP/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MQLM7ABVCYJLF6JRPF3M3EBXW63GNC27
https://crates.io/crates/compu-brotli-sys
https://github.com/github/advisory-database/issues/785
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4TOGTZ2ZWDH662ZNFFSZVL3M5AJXV6JF
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/W23CUADGMVMQQNFKHPHXVP7RPZJZNN6I/
https://usn.ubuntu.com/4568-1
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M4VCDOJGL6BK3HB4XRD2WETBPYX2ITF6
https://github.com/pypa/advisory-database/tree/main/vulns/brotli/PYSEC-2020-29.yaml
https://github.com/advisories/GHSA-5v8v-66v8-mwm7
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WW62OZEY2GHJL4JCOLJRBSRETXDHMWRK
https://rustsec.org/advisories/RUSTSEC-2021-0132.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J4E265WKWKYMK2RYYSIXBEGZTDY5IQE6
https://usn.ubuntu.com/4568-1/
https://lists.debian.org/debian-lts-announce/2020/12/msg00003.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J4E265WKWKYMK2RYYSIXBEGZTDY5IQE6/
https://github.com/google/brotli/pull/826
https://github.com/timlegge/perl-IO-Compress-Brotli/blob/8b44c83b23bb4658179e1494af4b725a1bc476bc/Changes#L52
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MMBKACMLSRX7JJSKBTR35UOEP2WFR6QP
https://github.com/bitemyapp/brotli2-rs/issues/45
https://www.mend.io/vulnerability-database/CVE-2020-36846

Severity Score

Weakness Type (CWE)

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CWE-120

Dependency on Vulnerable Third-Party Component

CWE-1395

Top Fix

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Upgrade Version

Upgrade to version microsoft.netcore.app.runtime.linux-arm - 3.1.23;microsoft.netcore.app.runtime.linux-arm - 5.0.15;microsoft.netcore.app.runtime.linux-arm - 6.0.3;microsoft.netcore.app.runtime.linux-arm64 - 3.1.23;microsoft.netcore.app.runtime.linux-arm64 - 5.0.15;microsoft.netcore.app.runtime.linux-arm64 - 6.0.3;microsoft.netcore.app.runtime.linux-musl-arm64 - 3.1.23;microsoft.netcore.app.runtime.linux-musl-arm64 - 5.0.15;microsoft.netcore.app.runtime.linux-musl-arm64 - 6.0.3;microsoft.netcore.app.runtime.linux-x64 - 3.1.23;microsoft.netcore.app.runtime.linux-x64 - 5.0.15;microsoft.netcore.app.runtime.linux-x64 - 6.0.3;microsoft.netcore.app.runtime.osx-x64 - 3.1.23;microsoft.netcore.app.runtime.osx-x64 - 5.0.15;microsoft.netcore.app.runtime.osx-x64 - 6.0.3;microsoft.netcore.app.runtime.win-arm - 3.1.23;microsoft.netcore.app.runtime.win-arm - 5.0.15;microsoft.netcore.app.runtime.win-arm - 6.0.3;microsoft.netcore.app.runtime.win-arm64 - 3.1.23;microsoft.netcore.app.runtime.win-arm64 - 5.0.15;microsoft.netcore.app.runtime.win-arm64 - 6.0.3;microsoft.netcore.app.runtime.win-x64 - 3.1.23;microsoft.netcore.app.runtime.win-x64 - 5.0.15;microsoft.netcore.app.runtime.win-x64 - 6.0.3;microsoft.netcore.app.runtime.win-x86 - 3.1.23;microsoft.netcore.app.runtime.win-x86 - 5.0.15;microsoft.netcore.app.runtime.win-x86 - 6.0.3;microsoft.netcore.app.runtime.mono.llvm.aot.linux-arm64 - 5.0.15;microsoft.netcore.app.runtime.mono.llvm.aot.linux-arm64 - 6.0.3;microsoft.netcore.app.runtime.mono.llvm.aot.linux-x64 - 5.0.15;microsoft.netcore.app.runtime.mono.llvm.aot.linux-x64 - 6.0.3;microsoft.netcore.app.runtime.mono.llvm.aot.osx-x64 - 5.0.15;microsoft.netcore.app.runtime.mono.llvm.aot.osx-x64 - 6.0.3;microsoft.netcore.app.runtime.mono.llvm.linux-arm64 - 5.0.15;microsoft.netcore.app.runtime.mono.llvm.linux-arm64 - 6.0.3;microsoft.netcore.app.runtime.mono.llvm.linux-x64 - 5.0.15;microsoft.netcore.app.runtime.mono.llvm.linux-x64 - 6.0.3;microsoft.netcore.app.runtime.mono.llvm.osx-x64 - 5.0.15;microsoft.netcore.app.runtime.mono.llvm.osx-x64 - 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6.0.3;microsoft.netcore.app.runtime.mono.tvossimulator-arm64 - 6.0.3;microsoft.netcore.app.runtime.mono.tvossimulator-arm64.msi.arm64 - 6.0.3;microsoft.netcore.app.runtime.mono.tvossimulator-arm64.msi.x64 - 6.0.3;microsoft.netcore.app.runtime.mono.tvossimulator-arm64.msi.x86 - 6.0.3;microsoft.netcore.app.runtime.mono.tvossimulator-x64 - 6.0.3;microsoft.netcore.app.runtime.mono.tvossimulator-x64.msi.arm64 - 6.0.3;microsoft.netcore.app.runtime.mono.tvossimulator-x64.msi.x64 - 6.0.3;microsoft.netcore.app.runtime.mono.tvossimulator-x64.msi.x86 - 6.0.3;microsoft.netcore.app.runtime.mono.win-x64 - 6.0.3;microsoft.netcore.app.runtime.mono.win-x86 - 6.0.3;microsoft.netcore.app.runtime.osx-arm64 - 6.0.3;brotli - 1.0.8

Learn More

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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