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CVE-2026-42285— GoBGP: Panic in AdjRib.Update via malformed BGP Update message (Nil Pointer Dereference)

Quick assessment

Affected
osrg gobgp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GoBGP是osrg开源的一种开源的边界网关协议（BGP）实现。 GoBGP 4.4.0版本存在代码问题漏洞，该漏洞源于未经身份验证的远程BGP对等体发送特制BGP UPDATE消息，服务器处理不一致属性长度时内部状态转换不当，导致AdjRib.Update函数中空指针取消引用，可能导致整个GoBGP进程崩溃。

CVSS 7.5 · High EPSS 0.42% · P35

Affected Version Matrix 1

VendorProduct Version RangeStatus
osrg gobgp = 4.4.0 affected
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I. Basic Information for CVE-2026-42285

Vulnerability Information
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Vulnerability Title
GoBGP: Panic in AdjRib.Update via malformed BGP Update message (Nil Pointer Dereference)
Source: CVE Program / CVE List V5
Vulnerability Description
GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.4.0, an unauthenticated remote BGP peer can trigger a fatal panic in GoBGP by sending a specially crafted BGP UPDATE message. When the server receives a message with inconsistent attribute lengths, it improperly handles the internal state transition to a "withdraw" action, leading to a nil pointer dereference in the AdjRib.Update function. This causes the entire GoBGP process to crash, resulting in a complete loss of service availability. This issue has been patched in version 4.5.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
GoBGP 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GoBGP是osrg开源的一种开源的边界网关协议（BGP）实现。 GoBGP 4.4.0版本存在代码问题漏洞，该漏洞源于未经身份验证的远程BGP对等体发送特制BGP UPDATE消息，服务器处理不一致属性长度时内部状态转换不当，导致AdjRib.Update函数中空指针取消引用，可能导致整个GoBGP进程崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
osrg gobgp = 4.4.0 -

II. Public POCs for CVE-2026-42285

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III. Intelligence Information for CVE-2026-42285

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Vendor Advisories for CVE-2026-42285 (1)

Vendor Pages for CVE-2026-42285 (1)

Same Patch Batch · osrg · 2026-05-07 · 3 CVEs total

CVE-2026-41643 7.5 HIGH GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE
CVE-2026-41642 7.5 HIGH GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute

IV. Related Vulnerabilities

Same product: gobgp
Same vendor: osrg
Same weakness: CWE-476

V. Comments for CVE-2026-42285

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