CVE-2026-28804CWE-407

pypdf: Inefficient decoding of ASCIIHexDecode streams

Medium · published March 6, 2026

CVSS v4.0
6.9
EPSS
1%
Percentile
44.4
In the wild
Unconfirmed
What it is

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.

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
0.00535 · 44.4th percentile
Weakness
CWE-407 · Inefficient Algorithmic Complexity
Published
2026-03-06T06:46Z
EPSS history
Timeline
  • 06 MAR 06:46Z
    pypdf: Inefficient decoding of ASCIIHexDecode streams
    cvelistv5