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Vulnerabilities

Vulnerability · CVE-2018-20103

An issue was discovered in dns.c in HAProxy through 1.8.14.

Published Dec 12, 2018 · catalog updated Jun 17, 2026 · An issue was discovered

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2018-20103. EPSS is 6.59%. Act only if a listed version of An issue was discovered is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (An issue was discovered).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
6.59%
Remediation
Version ranges on file
Affected products
cpe canonical/ubuntu linux · cpe haproxy/haproxy · cpe redhat/openshift container platform

An issue was discovered in dns.c in HAProxy through 1.8.14. In the case of a compressed pointer, a crafted packet can trigger infinite recursion by making the pointer point to itself, or create a long chain of valid pointers resulting in stack exhaustion.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe canonical/ubuntu linux16.04
  • cpe canonical/ubuntu linux18.04
  • cpe canonical/ubuntu linux18.10
  • cpe haproxy/haproxy<= 1.8.14
  • cpe redhat/openshift container platform3.11

How to fix CVE-2018-20103

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2018-20103. EPSS is 6.59%. Act only if a listed version of An issue was discovered is installed.

Which versions are affected?

Compare what you have installed with canonical/ubuntu linux 16.04; canonical/ubuntu linux 18.04; canonical/ubuntu linux 18.10; redhat/openshift container platform 3.11. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-835: Infinite Loop. EPSS 6.59%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

HAProxy security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 12, 2018 · Monitored products — high

    Detected

    An issue was discovered in dns.c in HAProxy through 1.8.14. In the case of a compressed pointer, a crafted packet can trigger infinite recursion by making the pointer point to itself, or create a long chain of valid pointers resulting in stack exhaustion.

  2. Jun 17, 2026 · Monitored products — high

    Updated

    An issue was discovered in dns.c in HAProxy through 1.8.14. In the case of a compressed pointer, a crafted packet can trigger infinite recursion by making the pointer point to itself, or create a long chain of valid pointers resulting in stack exhaustion.

Sources

  • CVE.orgVulnerability recordCVE-2018-20103

    Official CVE identifier

    cve.org
  • Monitored products — highVendor advisoryCVE-2018-20103

    An issue was discovered in dns.c in HAProxy through 1.8.14. In the case of a compressed pointer, a crafted packet can trigger infinite recursion by making the pointer point to itself, or create a long chain of valid pointers resulting in stack exhaustion.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • Monitored products — highNov 2, 2026