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CVE-2026-41642— GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute

Quick assessment

Affected
osrg gobgp
Exploitation
Public or AI PoC available; prioritize validation
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 4.3.0版本存在代码问题漏洞，该漏洞源于处理包含未识别Well-known路径属性的畸形BGP UPDATE消息时出现空指针取消引用，可能导致远程拒绝服务。

CVSS 7.5 · High EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
osrg gobgp = 4.3.0 affected
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I. Basic Information for CVE-2026-41642

Vulnerability Information
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Vulnerability Title
GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute
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 4.3.0, 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.
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 4.3.0版本存在代码问题漏洞，该漏洞源于处理包含未识别Well-known路径属性的畸形BGP UPDATE消息时出现空指针取消引用，可能导致远程拒绝服务。
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 = 4.3.0 -

II. Public POCs for CVE-2026-41642

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8942 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-41642

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Vendor Advisories for CVE-2026-41642 (1)

Vendor Pages for CVE-2026-41642 (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-2026-42285 7.5 HIGH GoBGP: Panic in AdjRib.Update via malformed BGP Update message (Nil Pointer Dereference)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-41642

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