CVE-2026-113791CWE-400CWE-770denial-of-service

CVE-2026-113791

published October 21, 2026

CVSS
6.0
EPSS
0%
Percentile
23.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
6.0 · NONE
CVSS v4.0
6.0 · 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
EPSS
0.00317 · 23.4th percentile
Weaknesses
CWE-400 · Uncontrolled Resource Consumption; CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-10-21T20:17Z
References (4)
https://github.com/py-pdf/pypdf/commit/18bd2981a74479483a0b9507602c58a63d6c9b12 · [email protected]https://github.com/py-pdf/pypdf/pull/4218 · [email protected]https://github.com/py-pdf/pypdf/releases/tag/6.21.0 · [email protected]https://github.com/py-pdf/pypdf/security/advisories/GHSA-cgf9-327m-v77c · [email protected]
EPSS history
Timeline
  • 23 OCT 03:55Z
    EPSS moved — → 0%
    epss
  • 21 OCT 15:37Z
    pypdf: Possible large memory usage when parsing content streams
    cvelistv5
  • 21 OCT 15:37Z
    pypdf: Possible large memory usage when parsing content streams
    cvelistv5