High severity · published Sep 30, 2026
CVE-2026-102993
pypdf: Possible large memory usage when retrieving Roman page labels
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.17.0, a crafted PDF can provide unusually large Roman page-label values that cause pypdf/_page_labels.py to generate excessively large numeral strings when an application retrieves document page labels, consuming large amounts of memory and potentially making the application unavailable. This issue is fixed in version 6.17.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PY
pypdf · py-pdf
< 6.17.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-102993
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-102993
x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/security/advisories/GHSA-qv6h-rv94-w285
x_refsource_MISC
https://github.com/py-pdf/pypdf/pull/4047
x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/89db7c4fe9315ecc964bfdf05a4e8c4b94175163
x_refsource_MISC
https://github.com/py-pdf/pypdf/releases/tag/6.17.0
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