CVE-2021-28676 Potential infinite loop in Pillow
An attacker can cause an infinite loop and denial of service by providing a malicious FLI image file to the Pillow library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-28676?
CVE-2021-28676 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 2 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in Pillow before 8.2.0. For FLI data, FliDecode did not properly check that the block advance was non-zero, potentially leading to an infinite loop on load.
Weakness: CWE-835
Which versions are affected by CVE-2021-28676?
4 open source packages ship an affected version, including pillow. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
pillow Bitnami | All versions | 8.2.0 |
pillow PyPI | All versions | 8.2.0 |
pillow PyPI | All versions | 8.2.0 |
pillow PyPI | All versions | 8.2.0 |
Products include Fedoraproject Fedora, Python Pillow.
How do I fix CVE-2021-28676?
Upgrade pillow to 8.2.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-28676 being exploited?
There is no known exploitation of CVE-2021-28676 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as ALPINE-CVE-2021-28676, BIT-pillow-2021-28676, DEBIAN-CVE-2021-28676, GHSA-7r7m-5h27-29hp, PYSEC-2021-92, ROOT-APP-PYPI-CVE-2021-28676 and 1 more.