CVE-2026-84310

pypdf: Possible long runtimes/large memory usage when retrieving outlines

State: Published
Severity: 4.8 Medium
Published: Sep 1, 2026
Updated: Sep 4, 2026
Reserved: Sep 1, 2026

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_doc_common.py _get_outline to consume long runtimes and large amounts of memory when retrieving document outlines with large numbers of entries or deeply nested reused paths because the traversal lacked global entry-count and nesting-depth limits. This issue is fixed in version 6.16.1.

Scores

CVSS	Score	Vector	Source
4.0	4.8 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-405 Asymmetric Resource Consumption (Amplification)
CWE-834 Excessive Iteration

Affected Products

Product	Versions
pypdfpy-pdf	< 6.16.1Affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.