{"id":"CVE-2021-25289","aliases":["BIT-pillow-2021-25289","GHSA-57h3-9rgr-c24m","PYSEC-2021-35"],"url":"https://o3.security/vulnerability/CVE-2021-25289","summary":"Out of bounds write in Pillow","details":"An issue was discovered in Pillow before 8.1.1. TiffDecode has a heap-based buffer overflow when decoding crafted YCbCr files because of certain interpretation conflicts with LibTIFF in RGBA mode. NOTE: this issue exists because of an incomplete fix for CVE-2020-35654.","published":"2021-03-19T04:15:13.280Z","modified":"2026-08-07T16:57:15.630947Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"pillow","fixedVersion":"8.1.1"}],"fix":{"url":"https://github.com/python-pillow/Pillow/commit/3fee28eb9479bf7d59e0fa08068f9cc4a6e2f04c","label":"python-pillow/Pillow@3fee28e"},"references":[{"type":"ADVISORY","url":"https://pillow.readthedocs.io/en/stable/releasenotes/8.1.1.html"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202107-33"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25289"},{"type":"WEB","url":"https://github.com/python-pillow/Pillow/commit/3fee28eb9479bf7d59e0fa08068f9cc4a6e2f04c"},{"type":"WEB","url":"https://github.com/python-pillow/Pillow/commit/cbfdde7b1f2295059a20a539ee9960f0bec7b299"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-57h3-9rgr-c24m"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2021-35.yaml"},{"type":"WEB","url":"https://github.com/python-pillow/Pillow"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T16:57:15.630947Z"}}