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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.

在 wicked 的 DHCPv4 数据包捕获代码中发现了一个越界读取（out-of-bounds read）漏洞。具体而言， 中的 函数错误地使用了 IP 报文的总长度（IP total length）作为 UDP 负载长度，而非实际剩余的 UDP 负载长度。这导致 DHCPv4 客户端（ ）中的 DHCP 选项遍历逻辑会尝试读取超出 1500 字节接收缓冲区末尾最多 字节（即最多 68 字节）的数据。因此，同一网络中经过认证或未认证的攻击者若能发送精心构造的 DHCP/UDP 数据包，就可以让客户端将相邻堆内存

CVSS 5.4 · Medium

Possible ATT&CK Techniques 1 AI

T1190.002
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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

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

V. Comments for CVE-2026-71402

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