CVE-2026-42285

GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.4.0, an unauthenticated remote BGP peer can trigger a fatal panic in GoBGP by sending a specially crafted BGP UPDATE message. When the server receives a message with inconsistent attribute lengths, it improperly handles the internal state transition to a "withdraw" action, leading to a nil pointer dereference in the AdjRib.Update function. This causes the entire GoBGP process to crash, resulting in a complete loss of service availability. This issue has been patched in version 4.5.0.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42285.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-476"
    ]
}

References

Affected packages

Git / github.com/osrg/gobgp

Affected ranges

Type

GIT

Repo

https://github.com/osrg/gobgp

Events

Introduced

12b4ebaef14f61e1c7c7403c770b67826f0b8cf4

Fixed

5f191066a78e2c1e929c54b5b75fe2c683c166e4

Database specific

{
    "source": [
        "CPE_STRING",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:osrg:gobgp:4.4.0:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "4.4.0"
        },
        {
            "last_affected": "4.4.0"
        }
    ]
}

Affected versions

4.*

4.4.0

= 4.*

= 4.4.0

v4.*

v4.4.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42285.json"