← Vulnerability feed

Vulnerability record · CVE-2016-1839 · published 20 May 2016

CVE-2016-1839: Apple iphone os out-of-bounds read vulnerability

Apple · Iphone Os

The xmlDictAddString 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 (heap-based buffer over-read) via a crafted XML document.

5.5 CVSS 3.0 Medium EPSS 7.3% · top 5.8% CWE-125 · Out-of-bounds read
5.5CVSS 3.0 base score, v2 4.3
7.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
14Affected product versions listed by NVD
48References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The xmlDictAddString 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 (heap-based buffer over-read) via a crafted XML document.

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

14 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.apple.com/archives/security-announce/2016/May/msg00001.html Mailing ListVendor Advisory
http://lists.apple.com/archives/security-announce/2016/May/msg00002.html Mailing ListVendor Advisory
http://lists.apple.com/archives/security-announce/2016/May/msg00003.html Mailing ListVendor Advisory
http://lists.apple.com/archives/security-announce/2016/May/msg00004.html Mailing ListVendor Advisory
http://rhn.redhat.com/errata/RHSA-2016-2957.html Third Party Advisory
http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html Third Party Advisory
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html Third Party Advisory
http://www.securityfocus.com/bid/90691 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1035890 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1038623 Third Party AdvisoryVDB Entry
http://www.ubuntu.com/usn/USN-2994-1 Third Party Advisory
http://xmlsoft.org/news.html Release NotesVendor Advisory
https://access.redhat.com/errata/RHSA-2016:1292 Third Party Advisory
https://bugzilla.gnome.org/show_bug.cgi?id=758605 ExploitIssue TrackingThird Party Advisory
https://git.gnome.org/browse/libxml2/commit/?id=a820dbeac29d330bae4be05d9ecd939ad6b4aa33 PatchThird Party Advisory
https://kc.mcafee.com/corporate/index?page=content&id=SB10170 PatchThird Party Advisory
https://security.gentoo.org/glsa/201701-37 Third Party Advisory
https://support.apple.com/HT206564 Vendor Advisory
https://support.apple.com/HT206566 Vendor Advisory
https://support.apple.com/HT206567 Vendor Advisory
https://support.apple.com/HT206568 Vendor Advisory
https://www.debian.org/security/2016/dsa-3593 Third Party Advisory
https://www.tenable.com/security/tns-2016-18 Third Party Advisory
http://lists.apple.com/archives/security-announce/2016/May/msg00001.html Mailing ListVendor Advisory
http://lists.apple.com/archives/security-announce/2016/May/msg00002.html Mailing ListVendor Advisory
http://lists.apple.com/archives/security-announce/2016/May/msg00003.html Mailing ListVendor Advisory
http://lists.apple.com/archives/security-announce/2016/May/msg00004.html Mailing ListVendor Advisory
http://rhn.redhat.com/errata/RHSA-2016-2957.html Third Party Advisory
http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html Third Party Advisory
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html Third Party Advisory
http://www.securityfocus.com/bid/90691 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1035890 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1038623 Third Party AdvisoryVDB Entry
http://www.ubuntu.com/usn/USN-2994-1 Third Party Advisory
http://xmlsoft.org/news.html Release NotesVendor Advisory
https://access.redhat.com/errata/RHSA-2016:1292 Third Party Advisory
https://bugzilla.gnome.org/show_bug.cgi?id=758605 ExploitIssue TrackingThird Party Advisory
https://git.gnome.org/browse/libxml2/commit/?id=a820dbeac29d330bae4be05d9ecd939ad6b4aa33 PatchThird Party Advisory

Track CVE-2016-1839 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2025-43300Apple iOS, iPadOS and macOS out-of-bounds write via malicious imageAn out-of-bounds write in Apple iOS, iPadOS and macOS is triggered when processing a malicious image file, causing memory corruption. Apple states th…KEVEPSS 22%analysed10.0CVE-2025-24201Apple WebKit out-of-bounds write allows sandbox escapeCVE-2025-24201 is an out-of-bounds write in Apple's WebKit that was addressed with improved checks. Maliciously crafted web content may break out of …KEVEPSS 3.8%analysed10.0CVE-2025-24085Apple iOS, iPadOS, macOS, tvOS, visionOS, watchOS Use-After-Free Privilege EscalationA use-after-free flaw in Apple's operating systems was fixed through improved memory management in iOS 18.3, iPadOS 18.3 and 17.7.6, macOS Sequoia 15…KEVEPSS 18%analysed9.8CVE-2025-31200Apple OS media parsing memory corruption allows code executionA memory corruption flaw in Apple's audio stream processing was fixed with improved bounds checking across iOS, iPadOS, macOS, tvOS, visionOS and wat…KEVEPSS 19%analysed9.8CVE-2025-31201Apple OS Pointer Authentication bypass via arbitrary read/writeApple removed vulnerable code that allowed an attacker holding arbitrary read and write capability to bypass Pointer Authentication across iOS, iPadO…KEVEPSS 14%analysed9.8CVE-2022-22587Apple iOS, iPadOS and macOS kernel memory corruption via out-of-bounds writeAn out-of-bounds write (CWE-787) in Apple iOS, iPadOS and macOS is caused by insufficient input validation and can corrupt memory. Apple states it is…KEVEPSS 12%analysed9.8CVE-2021-1870Apple WebKit logic flaw allows remote code executionA logic issue in Apple's WebKit was addressed with improved restrictions, affecting macOS Big Sur, Catalina, Mojave, iOS and iPadOS, plus WebKitGTK a…KEVEPSS 7.7%analysed9.8CVE-2021-1871Apple WebKit logic flaw allows remote code executionA logic issue in Apple's WebKit was addressed with improved restrictions. It affects macOS Big Sur, Catalina, Mojave, iOS and iPadOS, and a remote at…KEVEPSS 7.0%analysed

Source: NIST National Vulnerability Database (record CVE-2016-1839), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.