CVE-2021-29421

HIGHNVD 7.57.5—

7.5

models/metadata.py in the pikepdf package 1.3.0 through 2.9.2 for Python allows XXE when parsing XMP metadata entries.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 59.2%
KEV: Not listed

Published

April 1, 2021

Last Modified

November 21, 2024

References (8)

cve@mitrehttps://github.com/pikepdf/pikepdf/blob/v2.10.0/docs/release_notes.rst#v2100
cve@mitrehttps://github.com/pikepdf/pikepdf/commit/3f38f73218e5e782fe411ccbb3b44a793c0b343a
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36P4HTLBJPO524WMQWW57N3QRF4RFSJG/
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QFLBBYGEDNXJ7FS6PIWTVI4T4BUPGEQ/
af854a3a-2127-422b-91ae-364da2661108https://github.com/pikepdf/pikepdf/blob/v2.10.0/docs/release_notes.rst#v2100
af854a3a-2127-422b-91ae-364da2661108https://github.com/pikepdf/pikepdf/commit/3f38f73218e5e782fe411ccbb3b44a793c0b343a
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36P4HTLBJPO524WMQWW57N3QRF4RFSJG/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QFLBBYGEDNXJ7FS6PIWTVI4T4BUPGEQ/

Affected Packages

(1 across 1 ecosystem)

PyPI(1)

Package	Vulnerable range	Fixed in	Dependents
pikepdf	1.3.0 ... 2.9.2 (68 versions)	2.10.0	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-611Improper Restriction of XML External Entity Reference (XXE)

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 18:54 UTCEG score recompute
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-23 15:05 UTCOSV refresh

Frequently asked(5)

What is CVE-2021-29421?

CVE-2021-29421 is a high vulnerability published on April 1, 2021. models/metadata.py in the pikepdf package 1.3.0 through 2.9.2 for Python allows XXE when parsing XMP metadata entries.

When was CVE-2021-29421 disclosed?

CVE-2021-29421 was first published in the National Vulnerability Database on April 1, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-29421 actively exploited?

CVE-2021-29421 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 59.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-29421?

CVE-2021-29421 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-29421?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-29421, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-29421

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