CVE-2026-84311CWE-834

CVE-2026-84311

published September 2, 2026

CVSS
4.8
EPSS
0%
Percentile
3.5
In the wild
Unconfirmed
What it is

pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1.

The record
Technical detail
CVSS
4.8 · NONE
CVSS v4.0
4.8 · CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00138 · 3.5th percentile
Weakness
CWE-834 · Excessive Iteration
Published
2026-09-02T01:18Z
References (4)
https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942 · [email protected]https://github.com/py-pdf/pypdf/pull/3966 · [email protected]https://github.com/py-pdf/pypdf/releases/tag/6.16.1 · [email protected]https://github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2 · [email protected]
EPSS history
Timeline
  • 03 SEP 03:32Z
    EPSS moved — → 0%
    epss
  • 01 SEP 20:03Z
    pypdf: Possible long runtimes/large memory usage when extracting XForm objects
    cvelistv5