Medium 6.0Published Oct 21, 2026

CVE-2026-113789pypdf: Possible long runtimes/large memory usage when retrieving form fields

Updated under an hour ago (Oct 28, 2026, 9:30 AM ET)

Does this affect you?

It affects py-pdf pypdf. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

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 6.21.0, an attacker can craft a PDF that causes large memory usage or long runtimes when an application retrieves the document's form fields. This issue is fixed in version 6.21.0.

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-400, CWE-407
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: Awaiting Analysis
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 21, 2026

Affected products

Affected products

py-pdf pypdf py_pdf:pypdf (from the name)	before 6.21.0	CNA record

References

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-6vvc-x485-93v7	x-refsource-confirm
https://github.com/py-pdf/pypdf/pull/4219	x-refsource-misc
https://github.com/py-pdf/pypdf/commit/5ef728f0e16d225c853e89f861ba0a67402fe3f2	x-refsource-misc
https://github.com/py-pdf/pypdf/releases/tag/6.21.0	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.