High severity · published Oct 23, 2026
CVE-2026-115572
pypdf: Possible long runtimes for repeated references to the same missing object
New
7.1
CVSS
0.4%
EPSS
No
On KEV
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an attacker can craft a PDF that repeatedly references the same nonexistent indirect object, causing relevant file parts such as pages to trigger repeated full-file recovery loads and long runtimes when accessed. This issue is fixed in version 6.21.2.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PY
pypdf · py-pdf
< 6.21.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-115572
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-115572
github.com
https://github.com/py-pdf/pypdf/commit/68a0e5046cc9e14a6c24a21a713f3c7fbde18b4b
github.com
https://github.com/py-pdf/pypdf/pull/4240
github.com
https://github.com/py-pdf/pypdf/releases/tag/6.21.2
github.com
https://github.com/py-pdf/pypdf/security/advisories/GHSA-6c7f-9265-g8fw
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