Description
Use-after-free vulnerability in the xmlDictComputeFastKey function in libxml2 before 2.9.4, as used in Apple iOS before 9.3.2, OS X before 10.11.5, tvOS before 9.2.1, and watchOS before 2.2.1, allows remote attackers to cause a denial of service via a crafted XML document.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libxml2 | 2.9.3+dfsg1-1.1 | — |
| Debian 13 | libxml2 | 2.9.3+dfsg1-1.1 | — |
| Debian 12 | libxml2 | 2.9.3+dfsg1-1.1 | — |
| Debian 8 | libxml2 | 2.9.1+dfsg1-5+deb8u2 | DSA-3593-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | libxml2 | 2.9.3+dfsg1-1ubuntu0.1 | USN-2994-1 |
| Ubuntu 14.04 LTS | libxml2 | 2.9.1+dfsg1-3ubuntu4.8 | USN-2994-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | libxml2 +3 | 2.9.1-6.el7_2.3 | RHSA-2016:1292 |
| RHEL 6 | libxml2 +3 | 2.7.6-21.el6_8.1 | RHSA-2016:1292 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libxml2 | 2.9.4-1.22 | openSUSE-SU-2024:10192-1 |
| openSUSE Tumbleweed | python-libxml2 | 2.9.4-1.4 | openSUSE-SU-2024:10228-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | libxml2 +3 | 2.9.1-6.0.1.el7_2.3 | ELSA-2016-1292 |
Advisories 8
- RHSA-2016:1292 Red Hat Security Advisory: libxml2 security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- USN-2994-1 libxml2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3593-1 libxml2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10228-1 python-libxml2-2.9.4-1.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10192-1 libxml2-2-2.9.4-1.22 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-3381 libxml2: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Jun 30, 2025
- WID-SEC-2023-1614 Tenable Security Nessus Network Monitor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 25, 2023
- ELSA-2016-1292 Important: libxml2 security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 23, 2016
References
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- https://kc.mcafee.com/corporate/index?page=content&id=SB10170
- RHSA-2016:1292 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- https://support.apple.com/HT206567
- 90691 vdb-entry
- DSA-3593 vendor-advisory
- APPLE-SA-2016-07-18-4 vendor-advisory
- APPLE-SA-2016-07-18-3 vendor-advisory
- APPLE-SA-2016-07-18-2 vendor-advisory
- https://git.gnome.org/browse/libxml2/commit/?id=45752d2c334b50016666d8f0ec3691e2d680f0a0
- http://xmlsoft.org/news.html
- https://support.apple.com/HT206901
- APPLE-SA-2016-05-16-4 vendor-advisory
- USN-2994-1 vendor-advisory
- https://support.apple.com/HT206566
- http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
- APPLE-SA-2016-07-18-1 vendor-advisory
- APPLE-SA-2016-07-18-6 vendor-advisory
- https://www.tenable.com/security/tns-2016-18
- APPLE-SA-2016-05-16-3 vendor-advisory
- https://support.apple.com/HT206564
- RHSA-2016:2957 vendor-advisory
- GLSA-201701-37 vendor-advisory
- 1035890 vdb-entry
- https://support.apple.com/HT206905
- APPLE-SA-2016-05-16-2 vendor-advisory
- https://support.apple.com/HT206903
- https://support.apple.com/HT206902
- https://bugzilla.gnome.org/show_bug.cgi?id=759398
- https://support.apple.com/HT206904
- https://support.apple.com/HT206568
- APPLE-SA-2016-05-16-1 vendor-advisory
- https://support.apple.com/HT206899