Pillow before 8.1.1 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.
github.com/python-pillow/Pillow
github.com/python-pillow/Pillow/commit/756fff33128a0b643d10518a26ad04b726dd8973
lists.fedoraproject.org/archives/list/[email protected]/message/S7G44Z33J4BNI2DPDROHWGVG2U7ZH5JU
lists.fedoraproject.org/archives/list/[email protected]/message/TQQY6472RX4J2SUJENWDZAWKTJJGP2ML
lists.fedoraproject.org/archives/list/[email protected]/message/ZTSY25UJU7NJUFHH3HWT575LT4TDFWBZ
nvd.nist.gov/vuln/detail/CVE-2021-27921
pillow.readthedocs.io/en/stable/releasenotes/8.1.1.html
security.gentoo.org/glsa/202107-33