Medium 6.0Published Oct 21, 2026

CVE-2026-113791pypdf: Possible large memory usage when parsing content streams

Updated under an hour ago (2026-10-22 08:00 UTC)

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

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 6.21.0, an attacker can craft a PDF containing a content stream with many small operations, causing parsing to consume large amounts of memory. 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-770
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: Received
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

https://github.com/py-pdf/pypdf/security/advisories/GHSA-cgf9-327m-v77cx-refsource-confirm
https://github.com/py-pdf/pypdf/pull/4218x-refsource-misc
https://github.com/py-pdf/pypdf/commit/18bd2981a74479483a0b9507602c58a63d6c9b12x-refsource-misc
https://github.com/py-pdf/pypdf/releases/tag/6.21.0x-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.