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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.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-25289.json","reference_id":"","reference_type":"","scores":[{"value":"9.8","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-25289.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-25289","reference_id":"","reference_type":"","scores":[{"value":"0.00206","scoring_system":"epss","scoring_elements":"0.42954","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00206","scoring_system":"epss","scoring_elements":"0.43036","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00206","scoring_system":"epss","scoring_elements":"0.43048","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00206","scoring_system":"epss","scoring_elements":"0.42988","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00206","scoring_system":"epss","scoring_elements":"0.43005","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00206","scoring_system":"epss","scoring_elements":"0.4304","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00206","scoring_system":"epss","scoring_elements":"0.43017","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00206","scoring_system":"epss","scoring_elements":"0.42926","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00206","scoring_system":"epss","scoring_elements":"0.43004","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00206","scoring_system":"epss","scoring_elements":"0.4299","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00206","scoring_system":"epss","scoring_elements":"0.43018","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00762","scoring_system":"epss","scoring_elements":"0.73401","published_at":"2026-04-21T12:55:00Z"},{"value":"0.0083","scoring_system":"epss","scoring_elements":"0.746","published_at":"2026-04-24T12:55:00Z"},{"value":"0.0083","scoring_system":"epss","scoring_elements":"0.74606","published_at":"2026-04-26T12:55:00Z"},{"value":"0.0083","scoring_system":"epss","scoring_elements":"0.74607","published_at":"2026-04-29T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-25289"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25289","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25289"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"9.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/advisories/GHSA-57h3-9rgr-c24m","reference_id":"","reference_type":"","scores":[{"value":"9.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"9.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-57h3-9rgr-c24m"},{"reference_url":"https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2021-35.yaml","reference_id":"","reference_type":"","scores":[{"value":"9.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"value":"9.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2021-35.yaml"},{"reference_url":"https://github.com/python-pillow/Pillow","reference_id":"","reference_type":"","scores":[{"value":"9.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"value":"9.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/python-pillow/Pillow"},{"reference_url":"https://github.com/python-pillow/Pillow/commit/3fee28eb9479bf7d59e0fa08068f9cc4a6e2f04c","reference_id":"","reference_type":"","scores":[{"value":"9.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"value":"9.3","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/python-pillow/Pillow/commit/3fee28eb9479bf7d59e0fa08068f9cc4a6e2f04c"},{"reference_url":"https://github.com/python-pillow/Pillow/commit/cbfdde7b1f2295059a20a539ee9960f0b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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 an ICO container, and thus an attempted memory allocation can be very 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issue was discovered in Pillow before 8.1.1. 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boundaries.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-25291.json","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-25291.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-25291","reference_id":"","reference_type":"","scores":[{"value":"0.00536","scoring_system":"epss","scoring_elements":"0.67455","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00536","scoring_system":"epss","scoring_elements":"0.67534","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00536","scoring_system":"epss","scoring_elements":"0.67533","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00536","scoring_system":"epss","scoring_elements":"0.67522","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00536","scoring_system":"epss","scoring_elements":"0.67503","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00536","scoring_system":"epss","scoring_elements":"0.67524","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00536","scoring_system":"epss","scoring_elements":"0.67512","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00536","scoring_system":"epss","scoring_elements":"0.67476","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00536","scoring_system":"epss","scoring_elements":"0.6751","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00536","scoring_system":"epss","scoring_elements":"0.67523","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00536","scoring_system":"epss","scoring_elements":"0.675","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00536","scoring_system":"epss","scoring_elements":"0.67398","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00536","scoring_system":"epss","scoring_elements":"0.67486","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00536","scoring_system":"epss","scoring_elements":"0.67434","published_at":"2026-04-07T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-25291"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25291","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25291"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/advisories/GHSA-mvg9-xffr-p774","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"8.7","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-mvg9-xffr-p774"},{"reference_url":"https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2021-37.yaml","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.7","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2021-37.yaml"},{"reference_url":"https://github.com/python-pillow/Pillow","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.7","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/python-pillow/Pillow"},{"reference_url":"https://github.com/python-pillow/Pillow/commit/8b8076bdcb3815be0ef0d279651d8d1342b8ea61","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"8.7","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/python-pillow/Pillow/commit/8b8076bdcb3815be0ef0d279651d8d1342b8ea61"},{"reference_url":"https://github.com/python-pillow/Pillow/commit/cbdce6c5d054fccaf4af34b47f212355c64ace7a","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV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issue was discovered in Pillow before 8.1.1. The PDF parser allows a regular expression DoS (ReDoS) attack via a crafted PDF file because of a catastrophic backtracking regex.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-25292.json","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-25292.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-25292","reference_id":"","reference_type":"","scores":[{"value":"0.00147","scoring_system":"epss","scoring_elements":"0.35024","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00147","scoring_system":"epss","scoring_elements":"0.35172","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00147","scoring_system":"epss","scoring_elements":"0.35186","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00147","scoring_system":"epss","scoring_elements":"0.35148","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00147","scoring_system":"epss","scoring_elements":"0.35173","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00147","scoring_system":"epss","scoring_elements":"0.35208","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00147","scoring_system":"epss","scoring_elements":"0.35203","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00147","scoring_system":"epss","scoring_elements":"0.35177","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00147","scoring_system":"epss","scoring_elements":"0.35133","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00147","scoring_system":"epss","scoring_elements":"0.35252","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00147","scoring_system":"epss","scoring_elements":"0.35224","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00185","scoring_system":"epss","scoring_elements":"0.39861","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00185","scoring_system":"epss","scoring_elements":"0.39941","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00185","scoring_system":"epss","scoring_elements":"0.39956","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00185","scoring_system":"epss","scoring_elements":"0.40129","published_at":"2026-04-21T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-25292"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25292","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25292"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/advisories/GHSA-9hx2-hgq2-2g4f","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-9hx2-hgq2-2g4f"},{"reference_url":"https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2021-38.yaml","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2021-38.yaml"},{"reference_url":"https://github.com/python-pillow/Pillow","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/python-pillow/Pillow"},{"reference_url":"https://github.com/python-pillow/Pillow/commit/3bce145966374dd39ce58a6fc0083f8d1890719c","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"6.9","scoring_system":"cvssv4","scoring_elements":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/python-pillow/Pillow/commit/3bce145966374dd39ce58a6fc0083f8d1890719c"},{"reference_url":"https://github.com/python-pillow/Pillow/commit/521dab94c7ab72b037bd9a83e9663401e0f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