pypdf has possible infinite loop when cloning dictionaries

Description

References

• py-pdf/pypdf security advisory · WEB
• nvd.nist.gov/vuln/detail/CVE-2026-119205 · ADVISORY
• py-pdf/pypdf#4288 · WEB
• py-pdf/pypdf commit f176db1 · WEB
• py-pdf/pypdf · PACKAGE
• py-pdf/pypdf release 6.21.4 · WEB

pypdf 的其他漏洞

• CVE-2026-119203高危pypdf has possible infinite loop when hitting EOF in standard xref table during trailer search
• CVE-2026-119204高危pypdf has possible large memory usage when parsing page tree
• CVE-2026-119206高危pypdf has possible long runtimes when retrieving page labels
• CVE-2026-119207高危pypdf has possible large memory usage for exceptions in strict mode
• CVE-2026-119208高危pypdf has possible long runtimes/large memory usage for encrypted PDF files