CVE-2026-41168 — Excessive Iteration in Pypdf

CWE-834 — Excessive IterationCWE-1284 — Improper Validation of Specified Quantity in Input3 documents3 sources
Severity
6.9MEDIUMNVD
EPSS
0.0%
top 85.37%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
11
Py-pdf PypdfAnsible-automation-platform-25 Lightspeed-chatbot-rhel8Lightspeed-core Rag-tool-rhel9+8 more
Timeline
PublishedApr 22

Description

pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large `/Size` values or object streams with wrong large `/N` values. This has been fixed in pypdf 6.10.1. As a workaround, one may apply the changes from the patch manually.

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Affected Packages11 packages

▶CVEListV5py-pdf/pypdf< 6.10.1
▶Red Hatquay/quay-rhel8
▶Red Hatquay/quay-rhel9

📋Vendor Advisories

1
Red Hat
pypdf: pypdf: Denial of Service via crafted PDF with oversized streams↗2026-04-22
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💬Community

1
Bugzilla
CVE-2026-41168 pypdf: pypdf: Denial of Service via crafted PDF with oversized streams↗2026-04-22
▶
CVE-2026-41168 — Excessive Iteration in Py-pdf Pypdf | cvebase