CVE-2026-56114

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Source
https://cve.org/CVERecord?id=CVE-2026-56114
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56114.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-56114
Downstream
Published
2026-06-23T16:08:10.043Z
Modified
2026-07-08T08:12:41.305414952Z
Severity
  • 6.0 (Medium) CVSS_V4 - CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
dhcpcd Stack Out-of-Bounds Write in dhcp6_makemessage()
Details

dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTIONPDEXCLUDE option body. Attackers can send a crafted DHCPv6 ADVERTISE message containing an IAPD IAPREFIX /0 with a valid OPTIONPDEXCLUDE using an exclude prefix length of /121 through /128 to trigger the out-of-bounds write and potentially corrupt adjacent stack memory.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56114.json",
    "cwe_ids": [
        "CWE-787"
    ],
    "cna_assigner": "VulnCheck"
}
References

Affected packages

Git / github.com/networkconfiguration/dhcpcd

Affected ranges

Type
GIT
Repo
https://github.com/networkconfiguration/dhcpcd
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
2f00c7bfc408b6582d331932dfa47829c4819029
Database specific 
{
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:dhcpcd_project:dhcpcd:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "10.3.2"
        }
    ]
}

Affected versions

v10.*
v10.0.0
v10.0.1
v10.0.10
v10.0.2
v10.0.3
v10.0.4
v10.0.5
v10.0.6
v10.0.7
v10.0.8
v10.0.9
v10.1.0
v10.2.0
v10.2.1
v10.2.2
v10.2.3
v10.2.4
v10.3.0
v10.3.1
v10.3.2
v3.*
v3.2.3
v5.*
v5.0.1
v5.0.2
v5.0.3
v5.0.4
v5.0.5
v5.0.6
v5.1.0
v5.1.1
v5.1.2
v5.1.3
v5.1.4
v5.1.5
v5.2.0
v5.2.1
v5.2.10
v5.2.11
v5.2.12
v5.2.2
v5.2.3
v5.2.4
v5.2.6
v5.2.7
v5.2.9
v5.5.0
v5.5.1
v5.5.2
v5.5.3
v5.5.4
v5.5.5
v5.5.6
v5.6.0
v5.6.1
v5.6.2
v5.99.3
v5.99.6
v5.99.7
v6.*
v6.0.0
v6.0.1
v6.0.2
v6.0.3
v6.0.4
v6.0.5
v6.1.0
v6.10.0
v6.10.1
v6.10.2
v6.10.3
v6.11.0
v6.11.1
v6.11.2
v6.11.3
v6.2.0
v6.2.1
v6.3.0
v6.3.1
v6.3.2
v6.4.0
v6.4.1
v6.4.2
v6.4.3
v6.4.4
v6.4.5
v6.4.6
v6.4.7
v6.5.0
v6.5.1
v6.6.0
v6.6.1
v6.6.2
v6.6.3
v6.6.4
v6.6.5
v6.6.6
v6.6.7
v6.7.0
v6.7.1
v6.8.0
v6.8.1
v6.8.2
v6.9.0
v6.9.1
v6.9.2
v6.9.3
v6.9.4
v7.*
v7.0.0
v7.0.0-beta1
v7.0.0-beta2
v7.0.0-beta3
v7.0.0-rc1
v7.0.0-rc2
v7.0.0-rc3
v7.0.0-rc4
v7.0.1
v7.0.2
v7.0.3
v7.0.4
v7.0.5
v7.0.5a
v7.0.5b
v7.0.6
v7.0.7
v7.0.8
v7.1.0
v7.1.1
v8.*
v8.0.0
v8.0.1
v8.0.2
v8.0.3
v8.0.4
v8.0.5
v8.0.6
v8.1.0
v8.1.1
v8.1.2
v9.*
v9.0.0
v9.0.1
v9.0.2
v9.1.0
v9.1.1
v9.1.2
v9.1.3
v9.1.4
v9.2.0
v9.3.0
v9.3.1
v9.3.2
v9.3.3
v9.3.4
v9.4.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56114.json"