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    CVE-2026-5123

    A weakness has been identified in osrg GoBGP up to 4.3.0. This impacts the function DecodeFromBytes of the file pkg/packet/bgp/bgp.go. Executing a manipulation of the argument data[1] can lead to off-by-one. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is said to be difficult. This patch is called 67c059413470df64bc20801c46f64058e88f800f. A patch should be applied to remediate this issue.

    Published:Mar 30, 2026
    Last Modified:Apr 7, 2026
    EPS:Mar 30, 2026
    EPSS Score:0.00061
    CVSS Score:3.7

    Affected Products

    Vendor
    Osrg
    Product
    Gobgp

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-193 Off-by-one Error

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    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-2026-41642 (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…

    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