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pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires accessing the children of a TreeObject, for example as part of outlines. This vulnerability is fixed in 6.7.1.
Use CWE-835, Pypdf Project vendor hub and Pypdf product page to widen CVE-2026-27024 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2026-41168, CVE-2026-40260 and CVE-2026-28804 for nearby disclosures in the same product family.