CVE-2020-36846 IO::Compress::Brotli versions prior to 0.007 for Perl have an integer overflow in the bundled Brotli C library
An integer overflow in the bundled Brotli library allows attackers to cause a denial of service via large decompression inputs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-36846?
CVE-2020-36846 is a critical vulnerability in TIMLEGGE IO::Compress::Brotli, published on 30 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-1395
Which versions are affected by CVE-2020-36846?
How do I fix CVE-2020-36846?
Upgrade to a fixed version.
Is CVE-2020-36846 being exploited?
There is no known exploitation of CVE-2020-36846 in the wild and no public exploit code.
Sources
Also known as GHSA-44qx-v2f9-7rq9, UBUNTU-CVE-2020-36846.