CVE-2026-49838

    Dashboard / Vulnerabilities / CVE-2026-49838

    CVE-2026-49838

    Published: 10 Sept 2026Last Modified: 12 Sept 2026

    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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49838.json, https://github.com/osrg/gobgp/security/advisories/GHSA-frrj-87jh-2772, https://nvd.nist.gov/vuln/detail/CVE-2026-49838, https://github.com/osrg/gobgp/commit/4a319a6c25630fb3cdbda3e9ccfe56e702bdaaa0

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -4a319a6c25630fb3cdbda3e9ccfe56e702bdaaa0

    Affected versions

    v4.6.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-49838 | CVE-DB