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Back to active CVEs
Medium · CVSS 4.9CVE-2026-18103

Dhcp-server: dhcp-server: persistent denial of service due to buffer overflow via omapiCVE-2026-18103

Answer in brief

CVE-2026-18103 records a Medium severity (CVSS 4.9) vulnerability in Dhcp-server: dhcp-server: persistent denial of service due to buffer overflow via omapi. The current sources do not mark it as known exploited. The current feed maps Red Hat/dhcp (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 4, 2026Updated Aug 6, 2026Source checked Nov 3, 2026First seen by HOL Aug 4, 2026Material review Aug 6, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.9
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 4.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/dhcp (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/dhcpgeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/dhcp.
  2. 2Review the reported fix. Source-reported workaround: To mitigate this issue, secure OMAPI access by configuring TSIG key authentication to prevent unauthorized connections to the OMAPI port (7911). If the `dhcpd` service has already crashed due to this flaw, manually remove the problematic InfiniBand lease entry from `/var/lib/dhcpd/dhcpd.leases` and then restart the `dhcpd` service. Restarting the `dhcpd` service may temporarily interrupt DHCP services for clients.

Evidence timeline and material changes

  1. Published upstream

    Aug 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 4, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Solanum before commit 2ea1382 Buffer Overflow via Server-to-Server KILL HandlerAlso CWE-120

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-120
Source
CVE List V5
Source checked
Nov 3, 2026
References
2 linked sources
Open source record