CVE-2026-72522

MEDIUM

6.2

CVSS Score

Published: August 10, 2026 at 03:28 AM UTC

Updated: October 24, 2026 at 03:10 PM UTC

1 product affected across 1 vendorLibexpat

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Severity

MEDIUM6.2

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Libexpat · Libexpat Project

90%

0 ≤ v < 2.8.30

Affected range stops below 2.8.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

Source: cverecord

https://github.com/libexpat/libexpat/pull/1296

Source: cverecord

https://bugzilla.mozilla.org/show_bug.cgi?id=2053153

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.openwall.com/lists/oss-security/2026/08/11/5

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.2MEDIUMmitre

Attack Vector: LOCAL
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-125

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