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CVE-2020-36846

9.8 · CRITICAL

A buffer overflow, as described in CVE-2020-8927, exists in the embedded Brotli library.

Published May 30, 2025EPSS 0.63%

Overview

CVE-2020-36846 is a critical-severity vulnerability. It was published on May 30, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/advisories/GHSA-5v8v-66v8-mwm7GitHubgithub.com/google/brotli/commit/223d80cfbec8fd346e32906c732c8ede21f0cea6GitHubgithub.com/google/brotli/pull/826GitHubgithub.com/timlegge/perl-IO-Compress-Brotli/blob/8b44c83b23bb4658179e1494af4b725a1bc476bc/Changes#L52NVDnvd.nist.gov/vuln/detail/CVE-2020-8927

How CyberStrike helps

Frequently asked questions

What is CVE-2020-36846?

CVE-2020-36846 is a critical-severity vulnerability. It was published on May 30, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2020-36846?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-36846?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-36846?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-36846 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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