CVE-2021-27921: Uncontrolled Resource Consumption

March 3, 2021 (updated November 7, 2023)

Pillow allows attackers to cause a denial of service (memory consumption) because the reported size of a contained image is not properly checked for a BLP container, and thus an attempted memory allocation can be very large.

References

nvd.nist.gov/vuln/detail/CVE-2021-27921
pillow.readthedocs.io/en/stable/releasenotes/8.1.1.html

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