Medium Denial of service

CVE-2018-14567 — Infinite Loop in Canonical Ubuntu Linux

libxml2 2.9.8, if --with-lzma is used, allows remote attackers to cause a denial of service (infinite loop) via a crafted XML file that triggers LZMA_MEMLIMIT_ERROR, as demonstrated by xmllint, a different vulnerability than CVE-2015-8035 and CVE-2018-9251.

Published Aug 16, 2018 · Updated Oct 14, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: mitre

Low

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 4.3% (30-day exploitation probability)+14
Technical severity (medium)+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

4.35%

ahead of 91% of scored CVEs · Oct 14, 2026

Affects

Canonical

Ubuntu Linux and 2 more

CVSS base

6.5

Medium · 1 source(s)

Remediation

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

Documented patch — gitlab.gnome.org (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.

Identify exposed assets running the affected vendor/product/version combinations (Canonical Ubuntu Linux, Debian Debian Linux, Xmlsoft Libxml2).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
Apply the fixed version or the patch documented under Remediation.
Exploitation requires user interaction: tighten email/web filtering and warn affected users.
EPSS ahead of 91% of scored CVEs: prioritize it in the patch queue.
Search available logs for exploit probes matching the vulnerability class (denial of service), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Canonical	Ubuntu Linux	version 14.04version 16.04version 18.04	Vulnerable	NIST National Vulnerability Database
Debian	Debian Linux	version 8.0	Vulnerable	NIST National Vulnerability Database
Xmlsoft	Libxml2	version 2.9.8	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

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Every base score collected

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

Score	Version	Severity	Expl.	Impact	Scored by
6.5	CVSS 3.0	Medium	2.8	3.6	nvd@nist.gov via NIST National Vulnerability Database
4.3	CVSS 2.0	Medium	8.6	2.9	nvd@nist.gov via NIST National Vulnerability Database

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-835 · Infinite Loop

Other CVEs with this weakness →

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).
Track CPU/memory spikes and availability drops correlated with request patterns.

web/proxy/WAF logsnetwork IDS/IPSresource metrics

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 14, 2026
Fix documented
Oct 14, 2026 · NIST National Vulnerability Database
CVSS changed · 6.5
Oct 14, 2026 · NIST National Vulnerability Database
Source status changed · → Modified
Oct 14, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 14, 2026 · NIST National Vulnerability Database
2018
CVE published
Aug 16, 2018 · mitre

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 14, 2026 – Oct 14, 2026

References

6 on the record

gitlab.gnome.org/GNOME/libxml2/commit/2240fbf5912054af025fb6e01e26375100275e74
Patch, Third Party Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
cert-portal.siemens.com/productcert/html/ssa-398330.html
NIST National Vulnerability Database
lists.debian.org/debian-lts-announce/2018/09/msg00035.html
Third Party Advisory, mailing-list, x_refsource_MLIST, NIST National Vulnerability Database
lists.debian.org/debian-lts-announce/2020/09/msg00009.html
mailing-list, x_refsource_MLIST, NIST National Vulnerability Database
usn.ubuntu.com/3739-1/
Third Party Advisory, vendor-advisory, x_refsource_UBUNTU, NIST National Vulnerability Database
www.securityfocus.com/bid/105198
Third Party Advisory, VDB Entry, vdb-entry, x_refsource_BID, NIST National Vulnerability Database

Elsewhere on this site

Canonical
every CVE for this vendor

Denial of service
same class

CWE-835
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-12996 A use-after-free in OpenVPN 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote... Jul 30, 2026
High CVE-2026-11979 Stack-Based Buffer Overflow in libxml2 Jun 29, 2026
Medium CVE-2026-56968 Use of Uninitialized Resource in Gnu Sasl Jun 23, 2026
Critical CVE-2026-6653 libxml2 Use-After-Free in xmlParseInternalSubset Causing Denial of Service Jun 22, 2026
High CVE-2026-49975 Apache HTTP Server: mod_http2 denial of service Jun 8, 2026
Medium CVE-2026-47334 Deadlock or kernel panic in Ubuntu Linux AppArmor notification handling May 28, 2026

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 CISA SSVC assessment.
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-2018-14567 is "Infinite Loop in Canonical Ubuntu Linux", rated Medium. It affects Ubuntu Linux (Canonical); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 6.5 describes technical severity. EPSS 4.35% 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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