CVE-2026-28351CWE-400

Manipulated RunLengthDecode streams can exhaust RAM

Medium · published February 27, 2026

CVSS v4.0
6.9
EPSS
1%
Percentile
45.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
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
EPSS
0.00547 · 45.1th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-02-27T20:59Z
EPSS history
Timeline
  • 27 FEB 20:59Z
    Manipulated RunLengthDecode streams can exhaust RAM
    cvelistv5