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CVE-2021-3537

libxml2: NULL pointer dereference when post-validating mixed content parsed in recovery mode

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Severity

Moderate

Red Hat Product Security

7.5

CVSS 3.1

Review impact separately from score.

Published · May 1, 2021

Updated · October 14, 2026

Description

A NULL pointer dereference flaw was found in libxml2, where it did not propagate errors while parsing XML mixed content. This flaw causes the application to crash if an untrusted XML document is parsed in recovery mode and post validated. The highest threat from this vulnerability is to system availability.

Statement

For the flaw to be exploitable, the document must be parsed in recovery mode and post validated (e.g.: when used in the xmlling tool, both -recover and -postvalid options must be used for the flaw to be exploitable)

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-476 · NULL Pointer Dereference