Description
pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter. This has been fixed in pypdf 6.7.4. As a workaround, consider applying the changes from PR #3664.
Scores
CVSS v3
5.3
EPSS
0.0002
EPSS Percentile
4.9%
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-400
Status
published
Products (2)
pypdf_project/pypdf
< 6.7.4
pypi/pypdf
0 - 6.7.4PyPI
Published
Feb 27, 2026
Tracked Since
Feb 28, 2026