CVE-2026-56407CWE-190

libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen

Medium · published June 21, 2026

CVSS v3.1
6.9
EPSS
0%
Percentile
6.5
In the wild
Unconfirmed
What it is

libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen.

The record
Technical detail
CVSS v3.1
6.9 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00174 · 6.5th percentile
Weakness
CWE-190 · Integer Overflow or Wraparound
Published
2026-06-21T15:49Z
EPSS history
Timeline
  • 21 JUN 15:49Z
    libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen
    cvelistv5