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Fencer Vulns
medium 5.4

CVE-2026-71402 json

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

published 2026-08-27 2 mo ago modified 2026-09-01 2 mo ago also EUVD-2026-67080

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 16%
public exploits
0
none known

Summary

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.

Patch / fix

  • wicked SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 0.6.79-150400.3.44.1
  • wicked SLE Module for Basesystem 15 SP7 0.6.79-150700.3.8.1
  • wicked SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 0.6.79-150500.3.47.1
  • wicked SLES for SAP 15 SP6, SLES 15 SP6-LTSS 0.6.79-150600.11.20.1
  • wicked SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 0.6.79-3.61.1

suse advisories SUSE-SU-2026:3842-1SUSE-SU-2026:3841-1SUSE-SU-2026:3840-1SUSE-SU-2026:3839-1SUSE-SU-2026:3837-1

  • wicked openSUSE Tumbleweed 0.6.80-2.1
  • wicked openSUSE Leap 16.0 0.6.80-bp160.2.1

opensuse advisories openSUSE-SU-2026:11636-1openSUSE-SU-2026:21669-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-71402 updated cvss 5.4

wicked: wicked: Information Disclosure via crafted DHCPv4 packets

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 5.3 CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CNA 3.1 5.4 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CNA 4.0 5.3 CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • SUSE wicked

Classification

Weakness
  • CWE-125 Out-of-bounds Read
  • CWE-130 Improper Handling of Length Parameter Inconsistency

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.