---
id: CVE-2025-66382
title: >-
  In libexpat through 2.7.3, a crafted file with an approximate size of 2 MiB
  can lead to dozens of seconds of processing time.
summary: >-
  In libexpat through 2.7.3, a crafted file with an approximate size of 2 MiB
  can lead to dozens of seconds of processing time.
severity: low
cvss: 2.9
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'
cvssSource: cna
cwe:
  - CWE-407
vendor: libexpat project
product: libexpat
affected:
  - libexpat <= 2.7.5
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-12-03T16:08:41.228187Z'
published: '2025-11-28'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:09:35.169Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-66382'
references:
  - url: 'https://github.com/libexpat/libexpat/issues/1076'
tags:
  - cve.org
epss: 0.00203
epssPercentile: 0.09548
ingestedAt: '2026-10-15T05:52:46.065Z'
---

## Overview

In libexpat through 2.7.3, a crafted file with an approximate size of 2 MiB can lead to dozens of seconds of processing time.

## Affected

- `libexpat <= 2.7.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.