Medium 6.0Published Oct 21, 2026

CVE-2026-113794pypdf: Possible infinite loop when hitting EOF in standard xref table

Updated under an hour ago (Oct 28, 2026, 7:30 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for py-pdf pypdf

Exploited in the last 30 days

pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, an attacker can craft an incomplete PDF that ends inside a standard cross-reference table, causing pypdf to mishandle the unexpected end of file and enter an infinite loop. This issue is fixed in version 6.20.0.

CVSS: 6.0 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-835
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Undergoing Analysis
Record last updated: Oct 27, 2026
First seen by InfoSec Signals: Oct 21, 2026

Affected products

Affected products

py-pdf pypdf py_pdf:pypdf (from the name)	before 6.20.0	CNA record

References

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-39mj-jf6j-2qj3	x-refsource-confirm
https://github.com/py-pdf/pypdf/issues/4169	x-refsource-misc
https://github.com/py-pdf/pypdf/pull/4170	x-refsource-misc
https://github.com/py-pdf/pypdf/commit/37e1cd681744bac38b159f7e1c614eee8d639c58	x-refsource-misc
https://github.com/py-pdf/pypdf/releases/tag/6.20.0	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.