CVE-2026-18103

MEDIUMPre-NVD 4.94.9—
EchelonGraph scoreMEDIUM 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: 0.7%CVSS: 4.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
4.9MEDIUMmedium confidence
EG Risk
22
EG Risk 22/100CISA SSVC

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%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.7%
EPSS %ILE
51st
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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.

Affected Packages

(2 across 2 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
isc-dhcp4.4.3-P1-2 ... 4.4.3-P1-8 (9 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
isc-dhcp4.4.3-P1-8
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 62× 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.

Showing the most recent 100 of 149 total refreshes for this CVE.

  1. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-04 06:08 UTCEG score recompute
  3. 2026-10-04 06:08 UTCGHSA enrichment
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-02 10:05 UTCEG score recompute
  6. 2026-10-02 10:05 UTCGHSA enrichment
  7. 2026-10-01 19:49 UTCEPSS rescore
  8. 2026-10-01 02:24 UTCEG score recompute
  9. 2026-10-01 02:24 UTCGHSA enrichment
  10. 2026-09-30 15:02 UTCEPSS rescore
  11. 2026-09-29 15:20 UTCEPSS rescore
  12. 2026-09-29 06:24 UTCEG score recompute
  13. 2026-09-29 06:24 UTCGHSA enrichment
  14. 2026-09-28 13:51 UTCEPSS rescore
  15. 2026-09-27 17:56 UTCEG score recompute
  16. 2026-09-27 17:56 UTCGHSA enrichment
  17. 2026-09-27 13:47 UTCEPSS rescore
  18. 2026-09-26 15:58 UTCEPSS rescore
  19. 2026-09-25 07:01 UTCEG score recompute
  20. 2026-09-25 07:00 UTCGHSA enrichment
  21. 2026-09-24 05:48 UTCEG score recompute
  22. 2026-09-24 05:48 UTCGHSA enrichment
  23. 2026-09-23 04:12 UTCEG score recompute
  24. 2026-09-23 04:12 UTCGHSA enrichment
  25. 2026-09-22 03:02 UTCEG score recompute
Show 75 more
  1. 2026-09-22 03:01 UTCGHSA enrichment
  2. 2026-09-20 05:15 UTCEG score recompute
  3. 2026-09-20 05:15 UTCGHSA enrichment
  4. 2026-09-19 03:33 UTCEG score recompute
  5. 2026-09-19 03:33 UTCGHSA enrichment
  6. 2026-09-18 19:27 UTCEPSS rescore
  7. 2026-09-18 02:22 UTCEG score recompute
  8. 2026-09-18 02:22 UTCGHSA enrichment
  9. 2026-09-17 01:10 UTCEG score recompute
  10. 2026-09-17 01:10 UTCGHSA enrichment
  11. 2026-09-16 14:07 UTCEPSS rescore
  12. 2026-09-16 05:14 UTCEPSS rescore
  13. 2026-09-15 16:45 UTCEG score recompute
  14. 2026-09-15 16:45 UTCGHSA enrichment
  15. 2026-09-14 12:24 UTCEG score recompute
  16. 2026-09-14 12:24 UTCGHSA enrichment
  17. 2026-09-13 16:46 UTCEPSS rescore
  18. 2026-09-13 11:14 UTCEG score recompute
  19. 2026-09-13 11:14 UTCGHSA enrichment
  20. 2026-09-12 15:00 UTCEPSS rescore
  21. 2026-09-12 10:04 UTCEG score recompute
  22. 2026-09-12 10:04 UTCGHSA enrichment
  23. 2026-09-11 14:52 UTCEPSS rescore
  24. 2026-09-11 09:36 UTCEPSS rescore
  25. 2026-09-11 08:54 UTCEG score recompute
  26. 2026-09-11 08:54 UTCGHSA enrichment
  27. 2026-09-10 09:34 UTCEPSS rescore
  28. 2026-09-10 07:44 UTCGHSA enrichment
  29. 2026-09-09 06:34 UTCEG score recompute
  30. 2026-09-09 06:34 UTCGHSA enrichment
  31. 2026-09-08 22:00 UTCEPSS rescore
  32. 2026-09-07 18:28 UTCEG score recompute
  33. 2026-09-07 18:28 UTCGHSA enrichment
  34. 2026-09-07 16:01 UTCEPSS rescore
  35. 2026-09-06 13:47 UTCEPSS rescore
  36. 2026-09-06 12:30 UTCEG score recompute
  37. 2026-09-06 12:30 UTCGHSA enrichment
  38. 2026-09-05 11:20 UTCEG score recompute
  39. 2026-09-05 11:20 UTCGHSA enrichment
  40. 2026-09-04 10:07 UTCEG score recompute
  41. 2026-09-04 10:07 UTCGHSA enrichment
  42. 2026-09-04 05:06 UTCEPSS rescore
  43. 2026-09-03 08:54 UTCEG score recompute
  44. 2026-09-03 08:53 UTCGHSA enrichment
  45. 2026-09-02 14:11 UTCEPSS rescore
  46. 2026-09-02 07:40 UTCEG score recompute
  47. 2026-09-02 07:39 UTCGHSA enrichment
  48. 2026-09-01 13:53 UTCEPSS rescore
  49. 2026-09-01 04:39 UTCEPSS rescore
  50. 2026-09-01 00:30 UTCGHSA enrichment
  51. 2026-08-30 22:52 UTCEG score recompute
  52. 2026-08-30 22:52 UTCGHSA enrichment
  53. 2026-08-30 19:17 UTCEPSS rescore
  54. 2026-08-30 01:22 UTCEPSS rescore
  55. 2026-08-29 21:41 UTCEG score recompute
  56. 2026-08-29 21:41 UTCGHSA enrichment
  57. 2026-08-28 21:41 UTCEPSS rescore
  58. 2026-08-27 19:56 UTCEG score recompute
  59. 2026-08-27 19:56 UTCGHSA enrichment
  60. 2026-08-27 14:25 UTCEPSS rescore
  61. 2026-08-26 14:46 UTCEPSS rescore
  62. 2026-08-26 14:13 UTCEG score recompute
  63. 2026-08-26 14:13 UTCGHSA enrichment
  64. 2026-08-25 13:48 UTCEPSS rescore
  65. 2026-08-25 12:56 UTCEG score recompute
  66. 2026-08-25 12:56 UTCGHSA enrichment
  67. 2026-08-24 11:45 UTCEG score recompute
  68. 2026-08-24 11:45 UTCGHSA enrichment
  69. 2026-08-23 10:34 UTCEG score recompute
  70. 2026-08-23 10:34 UTCGHSA enrichment
  71. 2026-08-23 00:19 UTCEPSS rescore
  72. 2026-08-22 09:23 UTCEG score recompute
  73. 2026-08-22 09:23 UTCGHSA enrichment
  74. 2026-08-21 23:49 UTCEPSS rescore
  75. 2026-08-21 08:13 UTCEG score recompute

Related CVEs(same product + 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 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 0.7% probability of exploitation in the next 30 days (51st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18103?
CVE-2026-18103 has a CVSS base score of 4.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18103?
A fix for CVE-2026-18103 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-18103 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-18103

Explore →

Is Your Infrastructure Affected by CVE-2026-18103?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs