VDB-351220 · CVE-2026-32776 · EUVD-2026-12347

libexpat up to 2.7.4 null pointer dereference

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.
4.2	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in libexpat up to 2.7.4. Affected by this issue is some unknown functionality. Executing a manipulation can lead to null pointer dereference. This vulnerability is registered as CVE-2026-32776. The attack needs to be launched locally. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in libexpat up to 2.7.4 and classified as problematic. This vulnerability affects some unknown functionality. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. CVE summarizes:

libexpat before 2.7.5 allows a NULL pointer dereference with empty external parameter entity content.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-32776 since 03/16/2026. The exploitation appears to be easy. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 302511 (Linux Distros Unpatched Vulnerability : CVE-2026-32776), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.7.5 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (302511), EUVD (EUVD-2026-12347) and CERT Bund (WID-SEC-2026-0733). Once again VulDB remains the best source for vulnerability data.

Affected

Open Source expat

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: 4.3
VulDB Meta Temp Score: 4.2

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CNA Base Score: 4.0
CNA Vector (MITRE): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

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: 302511
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-32776

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: libexpat 2.7.5

Timelineinfo

03/16/2026 Advisory disclosed
03/16/2026 +0 days CVE reserved
03/16/2026 +0 days VulDB entry created
03/21/2026 +5 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-32776 (🔒)
GCVE (CVE): GCVE-0-2026-32776
GCVE (VulDB): GCVE-100-351220
EUVD: 🔒
CERT Bund: WID-SEC-2026-0733 - libexpat: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 03/16/2026 09:53
Updated: 03/21/2026 01:14
Changes: 03/16/2026 09:53 (62), 03/16/2026 10:14 (1), 03/16/2026 15:16 (7), 03/16/2026 22:13 (2), 03/21/2026 01:14 (12)
Complete: 🔍
Cache ID: 216::103