CVE-2026-29004

BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNSSERVERS option handler in networking/udhcp/d6dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6OPTDNSSERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the optionto_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29004.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "fixed": "42202bfb1e6ac51fa995beda8be4d7b654aeee2a"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ],
    "cwe_ids": [
        "CWE-122"
    ],
    "cna_assigner": "VulnCheck"
}

References

Affected packages

Git / github.com/vda-linux/busybox_mirror

Affected ranges

Type

GIT

Repo

https://github.com/vda-linux/busybox_mirror

Events

Introduced

Fixed

42202bfb1e6ac51fa995beda8be4d7b654aeee2a

Fixed

d368f3f7836d1c2484c8f839316e5c93e76d4409

Database specific

{
    "source": "REFERENCES"
}

Affected versions

Other

0_29alpha2

0_32

0_33

0_34

0_36

0_39

0_40

0_41

0_42

0_43

0_43pre1

0_45

0_46

0_47

0_48

0_49

0_50

0_51

0_52

0_60_0

0_60_1

0_60_2

0_60_3

0_60_4

0_60_5

1_00

1_00_pre1

1_00_pre10

1_00_pre2

1_00_pre3

1_00_pre4

1_00_pre5

1_00_pre6

1_00_pre7

1_00_pre8

1_00_pre9

1_00_rc1

1_00_rc2

1_00_rc3

1_10_0

1_12_0

1_14_0

1_15_0

1_16_0

1_17_0

1_18_0

1_19_0

1_1_0

1_1_1

1_20_0

1_21_0

1_22_0

1_23_0

1_24_0

1_25_0

1_26_0

1_27_0

1_28_0

1_29_0

1_2_0

1_30_0

1_31_0

1_32_0

1_33_0

1_34_0

1_35_0

1_36_0

1_37_0

1_4_0

1_8_0

1_9_0

Database specific

vanir_signatures_modified

"2026-05-28T08:04:55Z"

vanir_signatures

[
    {
        "target": {
            "file": "networking/udhcp/d6_dhcpc.c"
        },
        "id": "CVE-2026-29004-0abe9a5e",
        "signature_type": "Line",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "104404061497013662324149064247632850690",
                "308160726627569603545203631154146952659",
                "277438223464040087758205188748608768545",
                "793015573884571619813754960096703894",
                "329422852195009250767355069284508567523",
                "76042511958918376689793361767912376136",
                "63389914739850186264261794936578983049",
                "263893815115270570080536412219834014606",
                "166050399200526730753866396916237338125",
                "252981786517708999519373300633408963372",
                "112420271584400109273494638818688940115"
            ]
        },
        "signature_version": "v1",
        "source": "https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a",
        "deprecated": false
    },
    {
        "target": {
            "file": "networking/udhcp/d6_dhcpc.c",
            "function": "option_to_env"
        },
        "id": "CVE-2026-29004-c5e581e1",
        "signature_type": "Function",
        "digest": {
            "function_hash": "172096019965372411198333436523014313930",
            "length": 2486.0
        },
        "signature_version": "v1",
        "source": "https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a",
        "deprecated": false
    }
]

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-29004.json"