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    CVE-2026-41642

    GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP due to a nil pointer dereference. When a malformed BGP UPDATE message contains an unrecognized Path Attribute marked as "Well-known," the daemon fails to interrupt the message handling flow. This results in an illegal memory access and a full process crash (panic). This issue has been patched in version 4.4.0.

    Published:May 7, 2026
    Last Modified:May 7, 2026
    EPS:May 7, 2026
    EPSS Score:
    CVSS Score:7.5

    Affected Products

    Vendor
    Osrg
    Product
    Gobgp

    Exploits

    https://github.com/osrg/gobgp/security/advisories/GHSA-7235-89m6-f4pxhttps://github.com/osrg/gobgp/security/advisories/GHSA-7235-89m6-f4px

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-49838 (CVSS 5.9) — GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to …
    CVE-2026-49837 (CVSS 5.9) — GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Versions …
    CVE-2026-37462 (CVSS 7.5) — An integer underflow in the BGPUpdate.DecodeFromBytes function (/bgp/bgp.go) of gobgp v4.3.0 allows attackers …
    CVE-2026-41643 (CVSS 7.5) — GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to …
    CVE-2026-42285 (CVSS 7.5) — GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In versio…
    CVE-2026-7737 (CVSS 6.9) — A vulnerability was identified in osrg GoBGP up to 4.3.0. Affected by this issue is the function BMPPeerUpNoti…
    CVE-2026-7736 (CVSS 6.9) — A vulnerability was determined in osrg GoBGP up to 4.3.0. Affected by this vulnerability is the function parse…
    CVE-2026-7735 (CVSS 6.9) — A vulnerability was found in osrg GoBGP up to 4.3.0. Affected is the function PathAttributeAigp.DecodeFromByte…
    CVE-2026-7734 (CVSS 6.9) — A vulnerability has been found in osrg GoBGP up to 4.3.0. This impacts the function SRv6L3ServiceAttribute.Dec…
    CVE-2026-37461 (CVSS 7.5) — An out-of-bounds read in the ParseIP6Extended function (/bgp/bgp.go) of gobgp v4.3.0 allows attackers to cause…

    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