CVE-2026-71402
MediumCVSS 5.4Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In wicked up to version 0.6.80, an out-of-bounds read exists in the DHCPv4 packet capture code. The function ni_capture_inspect_udp_header() incorrectly reports the payload length, causing the DHCPv4 client to read up to 68 bytes past the receive buffer. An unauthenticated attacker on the same network can cause adjacent heap memory to be interpreted as DHCP options.
Risk Assessment
An attacker could cause information disclosure from heap memory into lease fields, potentially leading to exposure of sensitive data or disruption of the client.
Recommendation
Update wicked to a version newer than 0.6.80 or restrict trust in DHCP traffic on the network.
Original NVD description (English source)
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.