CVE-2026-18103— Dhcp-server: dhcp-server: persistent denial of service due to buffer overflow via omapi
Quick assessment
Affected
Red Hat Red Hat Enterprise Linux 6
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
DHCP Server是DHCP Server团队的一款动态主机配置协议服务端软件。 DHCP Server存在缓冲区错误漏洞，该漏洞源于print_hw_addr()函数缓冲区溢出，可能导致远程攻击者通过OMAPI端口发送包含过长InfiniBand MAC地址的特制租约创建请求，造成拒绝服务。
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1499 · Endpoint Denial of ServiceAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 6 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 7 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 8 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 9 | any |
affected |
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-18103
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Dhcp-server: dhcp-server: persistent denial of service due to buffer overflow via omapi
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
DHCP Server 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DHCP Server是DHCP Server团队的一款动态主机配置协议服务端软件。 DHCP Server存在缓冲区错误漏洞，该漏洞源于print_hw_addr()函数缓冲区溢出，可能导致远程攻击者通过OMAPI端口发送包含过长InfiniBand MAC地址的特制租约创建请求，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 6 | - |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 | - |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
II. Public POCs for CVE-2026-18103
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-18103
请登录查看更多情报信息。
Vendor Advisories for CVE-2026-18103 (1)
Same Patch Batch · Red Hat · 2026-08-04 · 6 CVEs total
| CVE-2026-42169 | 7.3 HIGH | Gimp: gimp apng loader heap-buffer-overflow when fctl width exceeds ihdr width (file-png.c |
| CVE-2026-68743 | 5.5 MEDIUM | Sssd: sssd: pam responder out-of-bounds read via unchecked auth_token_length in protocol v |
| CVE-2026-17614 | 4.4 MEDIUM | Wildfly-core: path traversal on wildfly domain controller |
| CVE-2026-18569 | 3.7 LOW | Keycloak-services: keycloak-services: oidc backchannel logout accepts unsigned forged logo |
| CVE-2026-68744 | 3.3 LOW | Sssd: sssd: nss responder uninitialized heap disclosure in initgroups reply |
IV. Related Vulnerabilities
Same product: Red Hat Enterprise Linux 6
-
CVE-2026-102474
Dash: dash: heap out-of-bounds write in conv_escape via unde -
CVE-2026-102473
Dash: dash: super-polynomial backtracking in pmatch when lib -
CVE-2026-90947
Gimp: gimp: out-of-bounds write in lighting effects plugin v -
CVE-2026-90949
Gimp: gimp: heap-based buffer overflow in psp loader due to -
CVE-2026-90948
Gimp: gimp: heap-based buffer overflow in ico loader via int
Same vendor: Red Hat
-
CVE-2026-103754
Ansible-runner: ansible-runner: path traversal and symlink e -
CVE-2026-96577
Oc-mirror__release-4.21: embedded local cache registry liste -
CVE-2026-83589
Oauth-proxy: open redirect via /\ and /\t bypass in post-log -
CVE-2026-103641
Gegl: gegl04: gegl: out-of-bounds read in the radiance hdr u -
CVE-2026-103399
Libsoup: soupserver: http/1 request smuggling via undrained
Same weakness: CWE-120
-
CVE-2026-103227
GPAC DASH Client dash_client.c gf_dash_resolve_url buffer ov -
CVE-2026-81433
Fireware OS Pre-Authentication Stack Buffer Overflow in fing -
CVE-2026-102296
ZoneMinder before 1.38.4 Buffer Overflow via HTTP Camera Res -
CVE-2026-6730
Multiple Vulnerabilities in IBM Concert Software -
CVE-2026-94101
Netcore NBR200V2 routerd vlan_load_form_uci buffer overflow
V. Comments for CVE-2026-18103
No comments yet