CVE Intelligence
Critical Memory corruption

CVE-2016-0718 — Buffer Errors (Improper Restriction of Operations within Memory Bounds) in Apple Mac Os X

Expat allows context-dependent attackers to cause a denial of service (crash) or possibly execute arbitrary code via a malformed input document, which triggers a buffer overflow.

Published May 26, 2016 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: redhat

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 13.3% (30-day exploitation probability)+14
  • Technical severity (critical)+10
  • Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
13.34%
ahead of 96% of scored CVEs · Oct 14, 2026
Affects
Apple
Mac Os X and 13 more
CVSS base
9.8
Critical · 1 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
None
none · proof-of-concept · active
Automatable
Yes
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

  • Documented patch — www.oracle.com (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Apple Mac Os X, Canonical Ubuntu Linux, Debian Debian Linux…).
  2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
  3. Apply the fixed version or the patch documented under Remediation.
  4. EPSS ahead of 96% of scored CVEs: prioritize it in the patch queue.
  5. Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Apple Mac Os X ≥ 10.11.0 and ≤ 10.11.5 Vulnerable NIST National Vulnerability Database
Canonical Ubuntu Linux version 12.04version 14.04version 16.04 Vulnerable NIST National Vulnerability Database
Debian Debian Linux version 8.0 Vulnerable NIST National Vulnerability Database
Libexpat Project Libexpat < 2.2.0 Vulnerable NIST National Vulnerability Database
Mcafee Policy Auditor < 6.5.1 Vulnerable NIST National Vulnerability Database
Mozilla Firefox < 48.0 Vulnerable NIST National Vulnerability Database
Opensuse Leap version 42.1 Vulnerable NIST National Vulnerability Database
Opensuse Opensuse version 13.1version 13.2 Vulnerable NIST National Vulnerability Database
Python Python ≥ 3.6.0 and < 3.6.2≥ 3.5.0 and < 3.5.4≥ 3.4.0 and < 3.4.7≥ 3.3.0 and < 3.3.7≥ 2.7.0 and < 2.7.15 Vulnerable NIST National Vulnerability Database
SUSE Linux Enterprise Debuginfo version 11-sp4 Vulnerable NIST National Vulnerability Database
SUSE Linux Enterprise Desktop version 12-sp1version 12 Vulnerable NIST National Vulnerability Database
SUSE Linux Enterprise Server version 12-sp1version 12version 11-sp4 Vulnerable NIST National Vulnerability Database
SUSE Linux Enterprise Software Development Kit version 12-sp1version 12version 11-sp4 Vulnerable NIST National Vulnerability Database
SUSE Studio Onsite version 1.3 Vulnerable NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
9.8 CVSS 3.1 Critical 3.9 5.9 nvd@nist.gov via NIST National Vulnerability Database
7.5 CVSS 2.0 High 10.0 6.4 nvd@nist.gov via NIST National Vulnerability Database
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-119 · Buffer Errors (Improper Restriction of Operations within Memory Bounds)

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 13.34%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
  • Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
web/proxy/WAF logsnetwork IDS/IPSendpoint telemetry (EDR)crash dumps

Timeline

What happened to this CVE, newest first.

  • 2026
  • SSVC assessment updated
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 13, 2026
  • Fix documented
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVSS changed · 9.8
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Modified
    Oct 13, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 13, 2026 · NIST National Vulnerability Database
  • 2016
  • CVE published
    May 26, 2016 · redhat

Source activity

Repeated readings are counted rather than listed.

  • 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

30 on the record

Elsewhere on this site

Apple
every CVE for this vendor
Memory corruption
same class
CWE-119
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-106016 Mitigation bypass in the File Handling component 9d
  • CVE-2026-100828 Mitigation bypass in the Bookmarks & History component 16d
  • CVE-2026-100831 Use-after-free in the DOM: UI Events & Focus Handling component 16d
  • CVE-2026-100829 Mitigation bypass in the DOM: Security component 16d
  • CVE-2026-100830 Mitigation bypass in the DOM: Navigation component 16d
  • CVE-2026-100826 Denial-of-service in the Storage: StorageManager component 16d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2016-0718 is "Buffer Errors (Improper Restriction of Operations within Memory Bounds) in Apple Mac Os X", rated Critical. It affects Mac Os X (Apple); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 9.8 describes technical severity. EPSS 13.34% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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