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CVE-2026-71402— wicked: out-of-bounds read in the DHCPv4 option parser due to payload length taken from the IP total length

Quick assessment

Affected
SUSE wicked
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.

openSUSE wicked是openSUSE社区开源的一套网络配置管理工具集。 openSUSE wicked 0.6.80及之前版本存在安全漏洞，该漏洞源于DHCPv4数据包捕获代码中的越界读取，ni_capture_inspect_udp_header()函数将IP总长度误作为剩余UDP有效载荷长度，可能导致同一网络的未经身份验证的攻击者通过发送特制DHCP/UDP数据包，使客户端将相邻堆内存解析为DHCP选项，从而将堆内容（如分配器元数据或指针值）解释到租约字段中。

CVSS 5.4 · Medium EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1190.002

Affected Version Matrix 1

VendorProduct Version RangeStatus
SUSE wicked ≤ 0.6.80 affected
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I. Basic Information for CVE-2026-71402

Vulnerability Information
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Vulnerability Title
wicked: out-of-bounds read in the DHCPv4 option parser due to payload length taken from the IP total length
Source: CVE Program / CVE List V5
Vulnerability Description
An out-of-bounds read was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c reports the IP total length as the payload length instead of the length of the remaining UDP payload. Consequently, the DHCP option walker in the DHCPv4 client (wickedd-dhcp4) reads up to ihl + 8 bytes — at most 68 bytes — past the end of the 1500-byte packet receive buffer. An unauthenticated attacker on the same network who sends a crafted DHCP/UDP packet can make the client parse adjacent heap memory as DHCP options, so that heap contents such as allocator metadata or pointer values can be interpreted into lease fields. The over-read is bounded to 68 bytes; no memory write, no attacker control over the adjacent bytes and no remote exfiltration primitive has been demonstrated. This issue affects wicked up to and including version 0.6.80.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
openSUSE wicked 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
openSUSE wicked是openSUSE社区开源的一套网络配置管理工具集。 openSUSE wicked 0.6.80及之前版本存在安全漏洞，该漏洞源于DHCPv4数据包捕获代码中的越界读取，ni_capture_inspect_udp_header()函数将IP总长度误作为剩余UDP有效载荷长度，可能导致同一网络的未经身份验证的攻击者通过发送特制DHCP/UDP数据包，使客户端将相邻堆内存解析为DHCP选项，从而将堆内容（如分配器元数据或指针值）解释到租约字段中。
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
SUSE wicked 0 ~ 0.6.80 -

II. Public POCs for CVE-2026-71402

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III. Intelligence Information for CVE-2026-71402

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Patches & Fixes for CVE-2026-71402 (1)

Vendor Advisories for CVE-2026-71402 (1)

IV. Related Vulnerabilities

Same product: wicked
Same vendor: SUSE
Same weakness: CWE-125