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Threat Intelligence
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GHSA-6c7f-9265-g8fw - pypdf: Possible long runtimes for repeated references to the same missing object

### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires loading relevant parts of a file (like their pages) where the same, but non-existent indirect object is referenced multiple times. ### Patches This has been fixed in [pypdf==6.21.2](https://github.com/py-pdf/pypdf/releases/tag/6.21.2). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4240](https://github.com/py-pdf/pypdf/pull/4240).
HIGH
Severity & confidence
Source severityhigh
Platform severityhigh
Confidenceconfirmed
Exploitationunknown
CVSS-
Affected
VendorspypdfRed Hat
Productspypdf
Reporting sources (3)
GitHub Security Advisories
Open source โ†—
Red Hat - CVE Feed
Open source โ†—
NIST NVD - National Vulnerability Database
Open source โ†—
Timeline & provenance
Published2026-10-23T20:55:15
Last updated2026-10-27T15:37:20
Ingested2026-10-23T20:56:57
FreshnessNEAR-REAL-TIME
Threat typeadvisory
Recommended action
Review the advisory and upgrade affected packages to the first patched version.
Next steps
  1. Identify affected systems in your environment.
  2. Apply the vendor patch or mitigation guidance.
  3. Review logs for indicators described in the advisory.
  4. Follow the affected vendor/product to track updates.
Confidence explanation
This object is reported by 3 independent sources.
Source type: vendor ยท Original: GitHub Security Advisories