CVE-2026-103000 pypdf - Denial of Service

pypdf < 6.19.0 contains a denial of service caused by unusually large alphabetical page-label values in _page_labels.py, letting attackers consume excessive memory and potentially make the application unavailable, exploit requires crafted PDF input.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.34% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
30 September 2026
Updated
15 October 2026
Weakness
CWE-400

Vendor fix

Update to version 6.19.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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