CVE-2026-27888
HIGHpypdf < 6.7.3 - Denial of Service via XFA Property with FlateDecode Compression
Title source: llmDescription
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.3, an attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the `xfa` property of a reader or writer and the corresponding stream being compressed using `/FlateDecode`. This has been fixed in pypdf 6.7.3. As a workaround, apply the patch manually.
References (4)
Core 4
Core References
Issue Tracking x_refsource_misc
https://github.com/py-pdf/pypdf/pull/3658
Vendor Advisory x_refsource_confirm
https://github.com/py-pdf/pypdf/security/advisories/GHSA-x7hp-r3qg-r3cj
Patch x_refsource_misc
https://github.com/py-pdf/pypdf/commit/7a4c8246ed48d9d328fb596942271da47b6d109c
Release Notes x_refsource_misc
https://github.com/py-pdf/pypdf/releases/tag/6.7.3
Scores
CVSS v3
7.5
EPSS
0.0035
EPSS Percentile
26.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-400
Status
published
Products (2)
pypdf_project/pypdf
< 6.7.3
pypi/pypdf
0 - 6.7.3PyPI
Published
Feb 26, 2026
Tracked Since
Feb 26, 2026