{"id":"CVE-2021-29421","aliases":["GHSA-ccgm-3xw4-h5p8","PYSEC-2021-34"],"title":"Improper Restriction of XML External Entity Reference in pikepdf","summary":"Improper Restriction of XML External Entity Reference in pikepdf","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","vendor":"pikepdf","product":"pikepdf","ecosystem":"pip","affected":["pikepdf >= 1.3.0, < 2.10.0"],"patched":["pikepdf 2.10.0"],"published":"2021-04-20","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:49:03.241318694Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-ccgm-3xw4-h5p8","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29421"},{"url":"https://github.com/pikepdf/pikepdf/commit/3f38f73218e5e782fe411ccbb3b44a793c0b343a"},{"url":"https://github.com/advisories/GHSA-ccgm-3xw4-h5p8"},{"url":"https://github.com/pikepdf/pikepdf"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/pikepdf/PYSEC-2021-34.yaml"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/36P4HTLBJPO524WMQWW57N3QRF4RFSJG"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3QFLBBYGEDNXJ7FS6PIWTVI4T4BUPGEQ"}],"tags":["osv","pip"],"epss":0.01681,"epssPercentile":0.75945,"ingestedAt":"2026-09-12T03:13:01.687Z","slug":"CVE-2021-29421","body":"## Overview\n\nmodels/metadata.py in the pikepdf package 1.3.0 through 2.9.2 for Python allows XXE when parsing XMP metadata entries.\n\n## Affected packages\n\n- `pikepdf >= 1.3.0, < 2.10.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `pikepdf 2.10.0`","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}