CVE-2026-102999 pypdf - Denial of Service

pypdf < 6.19.0 contains a denial of service caused by reparsing the full attachment list for each content lookup in the dictionary-based attachments API, letting attackers cause long runtimes, exploit requires crafted PDF with many embedded files.

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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