CVE-2026-18103

MEDIUMPre-NVD 4.94.9—
EchelonGraph scoreHIGH confidence

Score 4.9 from GitHub Security Advisory published 2026-08-05. a secondary CVSS source baseline 4.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.9Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A flaw was found in dhcp-server. A remote attacker with network access to the OMAPI (Open Management Application Programming Interface) port, especially if not secured with TSIG (Transaction Signature) key authentication, could send a specially crafted lease creation request. This request, containing an overly long InfiniBand MAC address, triggers a buffer overflow in the print_hw_addr() function. Successful exploitation leads to a persistent denial of service (DoS), causing the dhcpd service to crash and preventing it from restarting without manual intervention.

CVSS v3
4.9
EG Score
4.9(high)
EG Risk
22(Track)
EG Risk 22/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity49% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

August 4, 2026

Last Modified

August 6, 2026

Advisory Details (2)

Auto-updated Aug 4, 2026
Patch available. Sources: redhat.
redhat

Bug Access Denied

https://bugzilla.redhat.com/show_bug.cgi?id=2508081
redhat Patch Available

CVE-2026-18103 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-18103

Vendor Advisories for CVE-2026-18103(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 18× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 07:02 UTCEG score recompute
  3. 2026-08-20 07:02 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-19 05:52 UTCEG score recompute
  6. 2026-08-19 05:52 UTCGHSA enrichment
  7. 2026-08-18 13:48 UTCEPSS rescore
  8. 2026-08-18 04:41 UTCEG score recompute
  9. 2026-08-18 04:41 UTCGHSA enrichment
  10. 2026-08-17 13:47 UTCEPSS rescore
  11. 2026-08-17 03:31 UTCEG score recompute
  12. 2026-08-17 03:31 UTCGHSA enrichment
  13. 2026-08-16 14:56 UTCEPSS rescore
  14. 2026-08-16 02:21 UTCEG score recompute
  15. 2026-08-16 02:21 UTCGHSA enrichment
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-15 01:30 UTCEPSS rescore
  18. 2026-08-15 01:11 UTCGHSA enrichment
  19. 2026-08-14 00:01 UTCEG score recompute
  20. 2026-08-14 00:01 UTCGHSA enrichment
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-12 22:51 UTCEG score recompute
  23. 2026-08-12 22:51 UTCGHSA enrichment
  24. 2026-08-12 13:50 UTCEPSS rescore
  25. 2026-08-11 21:41 UTCEG score recompute
Show 23 more
  1. 2026-08-11 21:41 UTCGHSA enrichment
  2. 2026-08-11 13:42 UTCEPSS rescore
  3. 2026-08-11 00:00 UTCEPSS rescore
  4. 2026-08-10 20:31 UTCGHSA enrichment
  5. 2026-08-09 19:20 UTCEG score recompute
  6. 2026-08-09 19:20 UTCGHSA enrichment
  7. 2026-08-09 13:46 UTCEPSS rescore
  8. 2026-08-08 18:10 UTCEG score recompute
  9. 2026-08-08 18:10 UTCGHSA enrichment
  10. 2026-08-08 16:37 UTCEPSS rescore
  11. 2026-08-07 16:59 UTCEG score recompute
  12. 2026-08-07 16:59 UTCGHSA enrichment
  13. 2026-08-06 15:49 UTCEG score recompute
  14. 2026-08-06 15:49 UTCGHSA enrichment
  15. 2026-08-06 13:46 UTCEPSS rescore
  16. 2026-08-05 19:17 UTCEPSS rescore
  17. 2026-08-05 15:28 UTCEG score recompute
  18. 2026-08-05 15:28 UTCGHSA enrichment
  19. 2026-08-05 14:37 UTCEG score recompute
  20. 2026-08-05 14:37 UTCGHSA enrichment
  21. 2026-08-05 00:20 UTCEG score recompute
  22. 2026-08-04 23:21 UTCEG score recompute
  23. 2026-08-04 23:20 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18103?
CVE-2026-18103 is a medium vulnerability published on August 4, 2026. A flaw was found in dhcp-server. A remote attacker with network access to the OMAPI (Open Management Application Programming Interface) port, especially if not secured with TSIG (Transaction Signature) key authentication, could send a specially crafted lease creation request. This request,…
When was CVE-2026-18103 disclosed?
CVE-2026-18103 was first published in the National Vulnerability Database on August 4, 2026, with the most recent update on August 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18103 actively exploited?
CVE-2026-18103 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 66.5% of all scored CVEs.
What is the CVSS score of CVE-2026-18103?
CVE-2026-18103 has a CVSS v3 base score of 4.9 (NVD).
How do I remediate CVE-2026-18103?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18103, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-18103

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