VDB-276199 · CVE-2024-45490 · ID 887

libexpat up to 2.6.2 xmlparse.c XML_ParseBuffer xml external entity reference

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.3	$0-$5k	0.00

Summaryinfo

A vulnerability was found in libexpat up to 2.6.2. It has been rated as critical. Affected by this vulnerability is the function XML_ParseBuffer of the file xmlparse.c. This manipulation causes an unknown weakness. The identification of this vulnerability is CVE-2024-45490. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in libexpat up to 2.6.2. It has been declared as critical. Affected by this vulnerability is the function XML_ParseBuffer of the file xmlparse.c. The CWE definition for the vulnerability is CWE-611. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in libexpat before 2.6.3. xmlparse.c does not reject a negative length for XML_ParseBuffer.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2024-45490 since 08/30/2024. The exploitation appears to be easy. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 207755 (AlmaLinux 8 : expat (ALSA-2024:6989)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.6.3 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (207755), EUVD (EUVD-2024-41509) and CERT Bund (WID-SEC-2024-3692). Be aware that VulDB is the high quality source for vulnerability data.

Affected

Apple macOS

Productinfo

Name

libexpat

Version

Website

Product: https://github.com/libexpat/libexpat/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 9.8
CNA Vector (MITRE): 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Xml external entity reference
CWE: CWE-611 / CWE-610
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 207755
Nessus Name: AlmaLinux 8 : expat (ALSA-2024:6989)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: libexpat 2.6.3
Patch: github.com

Timelineinfo

08/30/2024 🔍
08/30/2024 +0 days 🔍
08/30/2024 +0 days 🔍
11/05/2025 +432 days 🔍

Sourcesinfo

Product: github.com

Advisory: 887
Status: Confirmed

CVE: CVE-2024-45490 (🔍)
GCVE (CVE): GCVE-0-2024-45490
GCVE (VulDB): GCVE-100-276199
EUVD: 🔍
CERT Bund: WID-SEC-2024-3692 - Apple macOS: Mehrere Schwachstellen

Entryinfo

Created: 08/30/2024 07:13
Updated: 11/05/2025 15:45
Changes: 08/30/2024 07:13 (56), 08/31/2024 13:53 (12), 09/05/2024 03:44 (12), 09/29/2024 23:24 (2), 10/18/2024 14:30 (3), 08/29/2025 21:57 (7), 11/05/2025 15:45 (1)
Complete: 🔍
Cache ID: 216::103