CVE-2026-29004

BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.

Database specific

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

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

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "42202bfb1e6ac51fa995beda8be4d7b654aeee2a"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "range":  [
                {
                    "fixed":  "42202bfb1e6ac51fa995beda8be4d7b654aeee2a"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "d368f3f7836d1c2484c8f839316e5c93e76d4409"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

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

source

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

vanir_signatures

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    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "104404061497013662324149064247632850690",
                "308160726627569603545203631154146952659",
                "277438223464040087758205188748608768545",
                "793015573884571619813754960096703894",
                "329422852195009250767355069284508567523",
                "76042511958918376689793361767912376136",
                "63389914739850186264261794936578983049",
                "263893815115270570080536412219834014606",
                "166050399200526730753866396916237338125",
                "252981786517708999519373300633408963372",
                "112420271584400109273494638818688940115"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-29004-0abe9a5e",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a",
        "target":  {
            "file":  "networking/udhcp/d6_dhcpc.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "172096019965372411198333436523014313930",
            "length":  2486
        },
        "id":  "CVE-2026-29004-c5e581e1",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a",
        "target":  {
            "file":  "networking/udhcp/d6_dhcpc.c",
            "function":  "option_to_env"
        }
    }
]

vanir_signatures_modified

"2026-10-21T09:51:17Z"