CVE-2026-28351 MEDIUM

CVE-2026-28351: Manipulated RunLengthDecode streams can exhaust RAM

Vendor Py-Pdf
Product pypdf
Weakness CWE-400
Published February 27, 2026
Last update March 3, 2026
View on NVD All CVEs

CVSS base score

6.9/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 27, 2026 CVE published
March 3, 2026 Record updated