Medium 4.6Published Mar 26, 2026

CVE-2026-33699pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream

Updated under an hour ago (Oct 27, 2026, 6:10 AM ET)

Does this affect you?

It affects py-pdf pypdf and 1 other product. 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. Versions prior to 6.9.2 have a vulnerability in which an attacker can craft a PDF which leads to an infinite loop. This requires reading a file in non-strict mode. This has been fixed in pypdf 6.9.2. If users cannot upgrade yet, consider applying the changes from the patch manually.

CVSS: 4.6 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
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: Analyzed
Record last updated: Mar 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

py-pdf pypdf py_pdf:pypdf (from the name)	before 6.9.2	CNA record
pypdf_project pypdf pypdf_project:pypdf	before 6.9.2	NVD

References

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-87mj-5ggw-8qc3	x-refsource-confirm, patch, vendor-advisory
https://github.com/py-pdf/pypdf/pull/3693	x-refsource-misc, issue-tracking, patch
https://github.com/py-pdf/pypdf/releases/tag/6.9.2	x-refsource-misc, product, release-notes

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.