CVE-2016-1839: apple iphone_os Out-of-bounds Read
Vulnerability summary
CVE-2016-1839 is a medium (CVSS 5.5) Out-of-bounds Read vulnerability in apple iphone_os. EPSS estimates a 7.35% chance of exploitation in the next 30 days, higher than 94.4% of scored vulnerabilities. 2 public exploits are recorded.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 10 · Related 6Timeline
- 20-05-2016PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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 metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS trend
Probability
7.35%
Chance of exploitation in the next 30 days
Percentile
94%
Versus all other CVEs
30-day change
No change 0.00 pp
From 7.35% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
2 foundExploit Reference (bugzilla.gnome.org)
Maturity: unknown
libxml2 - xmlDictAddString Heap Buffer Overread
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat6 products
- enterprise_linux_desktop6.0 | 7.0
- enterprise_linux_server6.0 | 7.0
- enterprise_linux_server_aus7.2 | 7.3 | 7.4 | 7.6
- enterprise_linux_server_eus7.2 | 7.3 | 7.4 | 7.5 | 7.6
- enterprise_linux_server_tus7.2 | 7.3 | 7.6
Debian2 products
- libxml2< 2.9.3+dfsg1-1.1
- debian_linuxEOL8.0
Canonical1 product
- ubuntu_linuxEOL12.04 | 14.04 | 15.10 | 16.04
Mcafee1 product
- web_gateway≥ 7.5.0.0, ≤ 7.5.2.10 | ≥ 7.6.0.0, ≤ 7.6.2.3
Ubuntu1 product
- libxml2< 2.9.1+dfsg1-3ubuntu4.8 | < 2.9.3+dfsg1-1ubuntu0.1
Xmlsoft1 product
- libxml2< 2.9.4
7 vendors · 16 products
References
28 links- www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.htmlX Refsource CONFIRMThird Party Advisory
- bugzilla.gnome.org/show_bug.cgi?id=758605X Refsource CONFIRMExploitIssue TrackingThird Party Advisory
- www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.htmlX Refsource CONFIRMThird Party Advisory
- lists.apple.com/archives/security-announce/2016/May/msg00004.htmlVendor AdvisoryX Refsource APPLEMailing ListREPORT
Show all 28 references
- git.gnome.org/browse/libxml2/commit/?id=a820dbeac29d330bae4be05d9ecd939ad6b4aa33X Refsource CONFIRMPatchThird Party Advisory
- www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.htmlX Refsource CONFIRMThird Party Advisory
- lists.apple.com/archives/security-announce/2016/May/msg00003.htmlVendor AdvisoryX Refsource APPLEMailing ListREPORT
- lists.apple.com/archives/security-announce/2016/May/msg00002.htmlVendor AdvisoryX Refsource APPLEMailing ListREPORT
- lists.apple.com/archives/security-announce/2016/May/msg00001.htmlVendor AdvisoryX Refsource APPLEMailing ListREPORT