CVE-2026-49838

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Source
https://cve.org/CVERecord?id=CVE-2026-49838
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49838.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-49838
Aliases
Downstream
Related
Published
2026-09-10T21:57:15Z
Modified
2026-09-13T03:30:46Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
GoBGP confederation validation panics on empty AS_PATH attribute
Details

GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.7.0, GoBGP accepts a zero-length AS_PATH during UPDATE decoding and later panics while validating that attribute for a confederation eBGP peer. The vulnerable path is in the BGP UPDATE validator: a malformed UPDATE that should be rejected as a malformed AS_PATH instead reaches an unchecked p.Value[0] access, allowing a configured confederation eBGP peer to trigger a denial of service. Version 4.7.0 patches the issue.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-129"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49838.json"
}
References

Affected packages

Git / github.com/osrg/gobgp

Affected ranges

Type
GIT
Repo
https://github.com/osrg/gobgp
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
4a319a6c25630fb3cdbda3e9ccfe56e702bdaaa0
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "4.7.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v1.*
v1.0
v1.1
v1.10
v1.11
v1.12
v1.13
v1.14
v1.15
v1.16
v1.17
v1.18
v1.19
v1.2
v1.20
v1.21
v1.22
v1.23
v1.24
v1.25
v1.26
v1.27
v1.28
v1.29
v1.3
v1.30
v1.31
v1.32
v1.33
v1.4
v1.5
v1.6
v1.7
v1.8
v1.9
v2.*
v2.0.0
v2.1.0
v2.10.0
v2.11.0
v2.12.0
v2.13.0
v2.14.0
v2.15.0
v2.16.0
v2.17.0
v2.18.0
v2.19.0
v2.2.0
v2.20.0
v2.21.0
v2.22.0
v2.23.0
v2.24.0
v2.25.0
v2.26.0
v2.27.0
v2.28.0
v2.29.0
v2.3.0
v2.30.0
v2.31.0
v2.32.0
v2.33.0
v2.34.0
v2.4.0
v2.5.0
v2.6.0
v2.7.0
v2.8.0
v2.9.0
v3.*
v3.0.0
v3.0.0-rc1
v3.0.0-rc2
v3.0.0-rc3
v3.0.0-rc4
v3.1.0
v3.10.0
v3.11.0
v3.12.0
v3.13.0
v3.14.0
v3.15.0
v3.16.0
v3.17.0
v3.19.0
v3.2.0
v3.20.0
v3.21.0
v3.22.0
v3.23.0
v3.24.0
v3.25.0
v3.26.0
v3.27.0
v3.28.0
v3.29.0
v3.3.0
v3.30.0
v3.31.0
v3.32.0
v3.33.0
v3.34.0
v3.35.0
v3.36.0
v3.37.0
v3.4.0
v3.5.0
v3.6.0
v3.7.0
v3.8.0
v3.9.0
v4.*
v4.0.0
v4.1.0
v4.2.0
v4.3.0
v4.4.0
v4.5.0
v4.6.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49838.json"