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Double Free Affecting libxml2 package, versions <2.9.10+dfsg-6.7+deb11u4

0.0
medium

Snyk CVSS

    Attack Complexity Low
    User Interaction Required
    Availability High

    Threat Intelligence

    EPSS 0.07% (30th percentile)
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NVD
6.5 medium
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SUSE
5.9 medium
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Red Hat
5.9 medium

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  • Snyk ID SNYK-DEBIAN11-LIBXML2-5423817
  • published 15 Apr 2023
  • disclosed 24 Apr 2023
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Introduced: 15 Apr 2023

CVE-2023-29469 Open this link in a new tab
CWE-415 Open this link in a new tab

How to fix?

Upgrade Debian:11 libxml2 to version 2.9.10+dfsg-6.7+deb11u4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libxml2 package and not the libxml2 package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

An issue was discovered in libxml2 before 2.10.4. When hashing empty dict strings in a crafted XML document, xmlDictComputeFastKey in dict.c can produce non-deterministic values, leading to various logic and memory errors, such as a double free. This behavior occurs because there is an attempt to use the first byte of an empty string, and any value is possible (not solely the '\0' value).