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Advisory record · GHSA-ccgm-3xw4-h5p8

Improper Restriction of XML External Entity Reference in pikepdf

CVSS 7.5 HighEPSS 0.017 · 77th percentile

Published by the GitHub Advisory Database at 20 Apr 2021, 16:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pikepdfPyPI>=1.3.0, <2.10.02.10.0
Identifiers
GHSA-ccgm-3xw4-h5p8 · CVE-2021-29421 · PYSEC-2021-34
Weakness (CWE)
CWE-611
Tags
Published
20 Apr 2021
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

pikepdf versions 1.3.0 through 2.9.2 are vulnerable to XML external entity (XXE) injection when parsing XMP metadata entries. The source gives few details on how the attack is triggered, so it is unclear whether a user must open a crafted PDF or whether other access is needed. Upgrade pikepdf to version 2.10.0 or later, which contains the fix.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.017, the 77th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:38 UTC First seen by agentprime
  2. 31 Oct 2026, 14:38 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.