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CVE-2026-41643— GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE

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之前版本存在输入验证错误漏洞，该漏洞源于处理4字节AS属性时内部切片索引移位处理不当，可能导致远程拒绝服务。

CVSS 7.5 · High EPSS 0.60% · P47

Affected Version Matrix 1

VendorProduct Version RangeStatus
osrg gobgp < 4.3.0 affected
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I. Basic Information for CVE-2026-41643

Vulnerability Information
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Vulnerability Title
GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE
Source: CVE Program / CVE List V5
Vulnerability Description
GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP where a malformed BGP UPDATE message can trigger a runtime error: index out of range panic. This occurs during the processing of 4-byte AS attributes when the message structure causes an internal slice index shift that is not properly handled. This issue has been patched in version 4.3.0.
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
对数组索引的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
GoBGP 输入验证错误漏洞
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之前版本存在输入验证错误漏洞，该漏洞源于处理4字节AS属性时内部切片索引移位处理不当，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-2026-41643

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10815 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-41643

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Vendor Advisories for CVE-2026-41643 (1)

Vendor Pages for CVE-2026-41643 (1)

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

CVE-2026-41642 7.5 HIGH GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute
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-129

V. Comments for CVE-2026-41643

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