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Permalink CVE-2026-18103
4.9 MEDIUM
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): High (H)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): None (N)
  • Integrity (I): None (N)
  • Availability (A): High (H)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): High (H)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): None (N)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): None (N)
  • Modified Availability (MA): High (H)
created 3 weeks, 4 days ago Activity log
  • Created suggestion
Dhcp-server: dhcp-server: persistent denial of service due to buffer overflow via omapi

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.

References

Affected products

dhcp

Matching in nixpkgs

pkgs.dhcpm

CLI tool for constructing & sending DHCP messages

pkgs.dhcpcd

Client for the Dynamic Host Configuration Protocol (DHCP)

pkgs.dhcpig

Tool to perform advanced DHCP exhaustion attack

  • nixos-unstable 1.6
    • nixpkgs-unstable 1.6
    • nixos-unstable-small 1.6
  • nixos-26.05 1.6
    • nixos-26.05-small 1.6
    • nixpkgs-26.05-darwin 1.6

pkgs.dhcping

Send DHCP request to find out if a DHCP server is running

  • nixos-unstable 1.2
    • nixpkgs-unstable 1.2
    • nixos-unstable-small 1.2
  • nixos-26.05 1.2
    • nixos-26.05-small 1.2
    • nixpkgs-26.05-darwin 1.2

pkgs.dhcpdump

Tool for visualization of DHCP packets as recorded and output by tcpdump to analyze DHCP server responses

  • nixos-unstable 1.10
    • nixpkgs-unstable 1.10
    • nixos-unstable-small 1.10
  • nixos-26.05 1.10
    • nixos-26.05-small 1.10
    • nixpkgs-26.05-darwin 1.10

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