High
GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE
Type: advisorySources: OSV
GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP where a malformed BGP UPDATE message can trigger a runtime error: index out of range panic. This occurs during the processing of 4-byte AS attributes when the message structure causes an internal slice index shift that is not properly handled. This issue has been patched in version 4.3.0.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-41643
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 06:01 UTC · Revision 1
Source evidence
GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE
core-osv · Original sourcePublished 7 May 2026, 11:53 UTC
GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP where a malformed BGP UPDATE message can trigger a runtime error: index out of range panic. This occurs during the processing of 4-byte AS attributes when the message structure causes an internal slice index shift that is not properly handled. This issue has been patched in version 4.3.0.
osv:CVE-2026-41643
Complete source record
{
"id": "02dac17b808e52184291b9c2bdff77dcc229af335fd23eaed923966fd69fd343",
"url": "https://osv.dev/vulnerability/CVE-2026-41643",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE",
"summary": "GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP where a malformed BGP UPDATE message can trigger a runtime error: index out of range panic. This occurs during the processing of 4-byte AS attributes when the message structure causes an internal slice index shift that is not properly handled. This issue has been patched in version 4.3.0.",
"evidence": "osv:CVE-2026-41643",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-41643",
"aliases": [
"CVE-2026-41643",
"GHSA-8rxh-r2p6-7f2q",
"GO-2026-5266"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/osrg/gobgp",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "c3eb0db6df91379e15ce1a8709cb1b64f482248e"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "4.3.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "c3eb0db6df91379e15ce1a8709cb1b64f482248e"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v4.3.0"
},
{
"cpe": "cpe:2.3:a:osrg:gobgp:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "4.3.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v4.2.0",
"v4.1.0",
"v4.0.0",
"v3.37.0",
"v3.36.0",
"v3.35.0",
"v3.34.0",
"v3.33.0",
"v3.32.0",
"v3.31.0",
"v3.30.0",
"v3.29.0",
"v3.28.0",
"v3.27.0",
"v3.26.0",
"v3.25.0",
"v3.24.0",
"v3.23.0",
"v3.22.0",
"v3.21.0",
"v3.20.0",
"v3.19.0",
"v3.17.0",
"v3.16.0",
"v3.15.0",
"v3.14.0",
"v3.13.0",
"v3.12.0",
"v3.11.0",
"v3.10.0",
"v3.9.0",
"v3.8.0",
"v3.7.0",
"v3.6.0",
"v3.5.0",
"v3.4.0",
"v3.3.0",
"v3.2.0",
"v3.1.0",
"v3.0.0",
"v3.0.0-rc4",
"v3.0.0-rc3",
"v3.0.0-rc2",
"v3.0.0-rc1",
"v2.34.0",
"v2.33.0",
"v2.32.0",
"v2.31.0",
"v2.30.0",
"v2.29.0",
"v2.28.0",
"v2.27.0",
"v2.26.0",
"v2.25.0",
"v2.24.0",
"v2.23.0",
"v2.22.0",
"v2.21.0",
"v2.20.0",
"v2.19.0",
"v2.18.0",
"v2.17.0",
"v2.16.0",
"v2.15.0",
"v2.14.0",
"v2.13.0",
"v2.12.0",
"v2.11.0",
"v2.10.0",
"v2.9.0",
"v2.8.0",
"v2.7.0",
"v2.6.0",
"v2.5.0",
"v2.4.0",
"v2.3.0",
"v2.2.0",
"v2.1.0",
"v2.0.0",
"v1.33",
"v1.32",
"v1.31",
"v1.30",
"v1.29",
"v1.28",
"v1.27",
"v1.26",
"v1.25",
"v1.24",
"v1.23",
"v1.22",
"v1.21",
"v1.20",
"v1.19",
"v1.18",
"v1.17",
"v1.16",
"v1.15",
"v1.14",
"v1.13",
"v1.12",
"v1.11",
"v1.10",
"v1.9",
"v1.8",
"v1.7",
"v1.6",
"v1.5",
"v1.4",
"v1.3",
"v1.2",
"v1.1",
"v1.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41643.json"
}
}
],
"modified": "2026-10-28T02:30:42.951235644Z",
"provider": "osv",
"references": [
"https://github.com/osrg/gobgp/releases/tag/v4.3.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41643.json",
"https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q",
"https://nvd.nist.gov/vuln/detail/CVE-2026-41643"
],
"provider_metadata": {
"cwe_ids": [
"CWE-129"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41643.json"
}
},
"related_cves": [
{
"value": "CVE-2026-41643",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 510920,
"published_at": "2026-05-07T11:53:23.566+00:00"
}