CVE-2026-49460CWE-407

pypdf: Inefficient decoding of FlateDecode PNG predictor streams

Medium · published June 22, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
5.5
In the wild
Unconfirmed
What it is

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.2, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /FlateDecode filter with a PNG predictor. This vulnerability is fixed in 6.12.2.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00166 · 5.5th percentile
Weakness
CWE-407 · Inefficient Algorithmic Complexity
Published
2026-06-22T20:28Z
EPSS history
Timeline
  • 22 JUN 20:28Z
    pypdf: Inefficient decoding of FlateDecode PNG predictor streams
    cvelistv5