CVE-2026-28804
MEDIUMpypdf < 6.7.5 - Denial of Service via ASCIIHexDecode Filter
Title source: llmDescription
pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.
References (4)
Core 4
Core References
Vendor Advisory x_refsource_confirm
https://github.com/py-pdf/pypdf/security/advisories/GHSA-9m86-7pmv-2852
Issue Tracking x_refsource_misc
https://github.com/py-pdf/pypdf/pull/3666
Patch x_refsource_misc
https://github.com/py-pdf/pypdf/commit/648c627d2657447dfb1773412af05a0a5103b98f
Release Notes x_refsource_misc
https://github.com/py-pdf/pypdf/releases/tag/6.7.5
Scores
CVSS v3
5.3
EPSS
0.0040
EPSS Percentile
31.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-407
Status
published
Products (2)
pypdf_project/pypdf
< 6.7.5
pypi/pypdf
0 - 6.7.5PyPI
Published
Mar 06, 2026
Tracked Since
Mar 06, 2026