Is CVE-2024-45491 actively exploited?

CVE-2024-45491 has no public evidence of in-the-wild exploitation as of 2025-11-04.

What is the CVSS score for CVE-2024-45491?

CVE-2024-45491 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2024-45491?

Patch guidance is available from libexpat project security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2024-45491.

Which products are affected by CVE-2024-45491?

1 product: libexpat project libexpat.

Fix CVE-2024-45491 - CRITICAL libexpat project libexpat

Description

An issue was discovered in libexpat before 2.6.3. dtdCopy in xmlparse.c can have an integer overflow for nDefaultAtts on 32-bit platforms (where UINT_MAX equals SIZE_MAX).

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-190 · Integer Overflow CWE-190 · Integer Overflow

Metadata

Primary Vendor: LIBEXPAT_PROJECT
Published: 8/30/2024
Last Modified: 11/4/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2024-45491

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary