CVE-2026-72522CWE-125

CVE-2026-72522

Medium · published August 10, 2026

CVSS v3.1
6.2
EPSS
0%
Percentile
8.3
In the wild
Unconfirmed
What it is

libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.

The record
Technical detail
CVSS v3.1
6.2 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00191 · 8.3th percentile
Weakness
CWE-125 · Out-of-bounds Read
Published
2026-08-10T08:16Z
References (3)
https://bugzilla.mozilla.org/show_bug.cgi?id=2053153 · [email protected]https://github.com/libexpat/libexpat/pull/1296 · [email protected]http://www.openwall.com/lists/oss-security/2026/08/11/5 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 10 AUG 03:28Z
    libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode…
    cvelistv5